Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c9bedc499a8ab4…

MALICIOUS

PDF

45.8 KB Created: 2021-09-08 22:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64c69bb5ea4762bb6b6260faa100a963 SHA-1: d3b6e545cfc01664a2c63549acee2c5941eb0524 SHA-256: e6c9bedc499a8ab4f65be73dea20dd6d4c4476920053909cea61a1f334b4a2cb
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also contains numerous external URIs pointing to various domains, with one identified as a link farm on disposable hosting. These factors, combined with ML and ClamAV detections, strongly suggest a malicious intent, likely phishing or malware delivery via a link to a secondary malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6918

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://crm333.com/documentos/file/kaxugonetemes.pdf In PDF document text
    • http://insuralead.com/userfiles/file/kipikike.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/xolezeruko.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/40696261577.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/60849783495.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff676c7c80---47365492209.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/74795268334.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/dotudezomujuwukid.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/oitd8ddshbk49lso7ccqd9mv3r/rubobelipotijud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=rick+y+morty+wallpaper+hd+androidPDF link annotation

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