Malicious PDF — malware analysis report

Static analysis result for SHA-256 35145695e44ef3d9…

MALICIOUS

PDF

56.1 KB Created: 2021-04-27 14:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7df3a4b9d33490847ed2b4c419e903aa SHA-1: feb64078675c8653d31e9ff9fc14c519f94b2ad1 SHA-256: 35145695e44ef3d96e1694032d2281fee1e23e3df59fff0f5fa0a0cbdcc3b68a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan, and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to potentially disposable domains or link farms, suggests an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically to appear as a legitimate document while hosting malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9433

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ambrose.edu/sites/default/files/webform/2306024917.pdf
    • https://www.jwico.com/sites/default/files/webform/kupoxogij.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/doxuwekuwazomiloxeri.pdf
    • https://ambrose.edu/sites/default/files/webform/52499587618.pdf
    • http://seiary.com/sites/default/files/webform/rec/47545977947.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/29410319198.pdf
    • https://www.pharoxglobal.com/sites/default/files/webform/zomufajiwadusepa.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/vawutudujenopudup.pdf
    • https://www.termis.org/system/files/webform/nibobuzokojovafizuza.pdf
    • https://www.dgs-interparts.be/sites/default/files/xufatonapa.pdf
    • https://web.liderpapel.com/sites/default/files/webform/wavunivuzabanovomid.pdf
    • https://www.termis.org/system/files/webform/manejuwavujegajejumoxak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=echo+leaf+blower+reviews+home+depot
    • https://community.princeton.edu/system/files/webform/luzixuganigofifabeja.pdf
    • https://community.princeton.edu/system/files/webform/36479690150.pdf
    • https://campusrec.princeton.edu/system/files/webform/xapedejezorim.pdf

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