Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f79837f101886f…

MALICIOUS

PDF

58.4 KB Created: 2021-04-19 17:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b954585d18e595364ac184487a966021 SHA-1: 653ae923bfa7c2257e1f971e52c8311754c89b9b SHA-256: b9f79837f101886f5d2aeedc28f3c2f713fa4486724b96ef76643213a680b1aa
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm and potentially a phishing lure. Although no executable scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites. The presence of multiple unknown URLs warrants investigation as potential IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6847

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://www.woonsocketri.org/system/temporary/webform/mupiroto.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/21555212736.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/10654010608.pdf
    • https://ambrose.edu/sites/default/files/webform/rebunedirewe.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/mibotemesasis.pdf
    • https://europa-ts.ru/sites/default/files/webform/totikejeropisatuzubafaba.pdf
    • https://www.jwico.com/sites/default/files/webform/pagijan.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/danodajanenalidadalibebav.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/bugoxugokerudanetisene.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/39809543560.pdf
    • http://www.friendlycc.com/sites/default/files/webform/zuguxinukebezukul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dream+of+best+friend+pregnant
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/86402477901.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/vojevo.pdf
    • https://campusrec.princeton.edu/system/files/webform/popikinof.pdf

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