Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbdadea28d489d53…

MALICIOUS

PDF

64.0 KB Created: 2021-10-07 01:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4f6c8f2a1a7d2bbb5b517bef40a0a45f SHA-1: c4a0376de4a4766effb8c98438c23da8cefc7ab4 SHA-256: cbdadea28d489d53ff247589cb84e8708e5c7de78c70f48cac6d69537d51a4c0
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, indicating an attempt to redirect the user to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a lure for phishing or malware distribution. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7402

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://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613e985374433---27463539986.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613083c72fd89---pogoganuzisilagud.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/46927888286.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/rinusimatovokanexoga.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/xidikos.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/falanowamo.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/76141073381.pdfIn PDF document text
    • https://kapefashion.com/files/files/45080571190.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/nexegeke.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/suxofowapatojomokabawexop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=previous+presidential+candidatesPDF link annotation

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