domain

Z-library.sk (Domain) Investigation Report

Generated on Oct 6, 2025

Recommendation

Avoid

Overall Summary

Suspicious

Why we think so?

High traffic but high risk. z-library.sk appears to be one of several Z‑Library mirror/copycat domains that attract large global usage (SimilarWeb estimates ~13.7M monthly visits) while operating in a legally fraught space and drawing frequent scam reports. Security reporting and community investigations link Z‑Library mirrors and look‑alike sites to phishing and payment scams that have cost users money and exposed credentials. At the same time, automated checks (Google Safe Browsing, crypto blacklist) show no active malware listing — which reduces immediate technical danger but does not remove the clear legal and reputational risks. Overall: treat z-library.sk as suspicious and avoid giving it money, passwords, or personal data. Verify any access through trusted community channels before use. 🛡️

Confidence Score Our overall confidence rating for this entity based on public signals, activity, and risk checks.

21%

Risk Insights

⚠️

High traffic, high exposure

SimilarWeb estimates ~13.7M monthly visits, making the domain a large target for scammers.
Large audience increases potential impact of data leaks or payment scams.

Category Scores

Red Flags & Warnings

Multiple independent reports tie Z‑Library mirrors and copycats to phishing, payment scams, and large user data exposure.
Reputation trackers and community warnings list z-library.sk among high‑risk or potentially fraudulent Z‑Library domains.
No authoritative trademark registrations or verifiable corporate identity found for the domain.
Contact scraping returned no institutional emails; phone numbers appear to be book identifiers rather than legitimate business lines.
Z‑Library network has been subject to law enforcement seizures and indictments, which raises legal and service continuity risks for any active mirror.

Detailed Checks & Insights

0-100 Scale

Identity verification (WHOIS / official contacts / trademark)

Score: 20

Failed

"Scraped contacts returned social links and phone-like values that look like book ISBNs rather than working business phone numbers; USPTO search returned no matching registrations for this exact name."

Reason: No authoritative WHOIS/trademark evidence or verified company email found; social links exist but are not proof of legal identity.

Reputation & third‑party reports

Score: 22

Failed

"Cybersecurity reports (Cybernews, heise), community trackers, and scamadviser-style warnings repeatedly warn about phishing/malicious mirrors and user losses."

Reason: Multiple independent news and security sources document scams and data leaks tied to Z‑Library copycats; some reputation services flag the domain as risky.

Technical infrastructure and hosting

Score: 60

Passed

"SimilarTech detected nginx, PHP, Amazon and Google services, and many adnetworks — this is consistent with a high-traffic site using standard web infrastructure."

Reason: Uses mainstream hosting and advertising technologies and enforces HTTPS which reduces indicators of low-effort malicious hosting.

Content & business model (legality / monetization)

Score: 25

Failed

"The site’s business model (mirror of Z‑Library) exposes users to legal risk and makes the site a frequent target for scams that monetize via payments or credential theft."

Reason: Domain is associated with the Z‑Library ecosystem, which historically distributes copyrighted material without authorization and has been targeted by law enforcement.

Phishing / blacklist presence

Score: 40

Failed

"Automated blacklist checks were clean at scan time, but historical reports and community evidence indicate active phishing campaigns have targeted Z‑Library users."

Reason: No active Google Safe Browsing or crypto blacklist listings were found, but independent reports document active phishing and payment scams across Z‑Library mirrors.

Your Next Steps

1

Do not pay or send cryptocurrency to offers from z-library.sk or similarly named mirror sites.
2

Avoid logging in or submitting personal information on the site until you confirm an official mirror via trusted community channels (official project social accounts, known community-maintained lists).
3

Check domain WHOIS and registrar records and request more identity info from the site; if WHOIS is redacted, treat that as additional risk.
4

Report suspicious payment requests or phishing pages to your bank, to Google Safe Browsing, and to anti‑scam forums (e.g., Cybernews/TorrentFreak posts) so others are warned.
5

If you used the site and entered credentials or payment info, change passwords immediately, enable 2FA on affected accounts, and monitor for credential reuse or fraud.