Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0b0ad28d476863…

MALICIOUS

PDF

54.2 KB Created: 2021-04-09 22:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 041292ef7b65cb581dcb65483ac96ca9 SHA-1: cbd44c2d8e487eb820cad713a26cfaa5c900b1e7 SHA-256: 5c0b0ad28d47686324e972c6296f6d959022ea425303a5669c84e7efcad8d029
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to seemingly legitimate university or organizational sites but are used in a link farm pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6365

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/42416127327.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/lerudaxalopavowurugepoviw.pdf
    • https://ambrose.edu/sites/default/files/webform/11364316539.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/tajiwugebewozebukak.pdf
    • https://aboss.by/sites/default/files/webform/76513539396.pdf
    • https://ambrose.edu/sites/default/files/webform/talizovub.pdf
    • https://web.liderpapel.com/sites/default/files/webform/xikamiwaboloz.pdf
    • https://www.dgs-interparts.be/sites/default/files/7838369457.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/71502920023.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/zavemazawutojene.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sacred+geometry+architecture+books
    • https://printandmail.princeton.edu/system/files/webform/ziwilijevugibapuvoboka.pdf
    • https://gradfutures.princeton.edu/system/files/webform/48950823745.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/83703622856.pdf

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