Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5c9daaf45029f8…

MALICIOUS

PDF

46.9 KB Created: 2021-03-04 05:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff127020550f06fdad8e6f43d6309076 SHA-1: d908b31be037a6c8b894857cfcde8198dd745fcd SHA-256: af5c9daaf45029f8c09b872c29dc1d254e3c096438985fa7cb9c4c752096e39e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that lead to other PDF files, suggesting a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6731

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://baarspo.ru/123?utm_term=descargar+biblia+de+estudio+plenitud+gratis+espa%25C3%25B1ol
    • http://vumexovuvelafe.medianewsonline.com/necchi_270_sewing_machine_price.pdf
    • http://vobasexukux.iblogger.org/tuxuveno.pdf
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/topemalenejuwo-luzokaxarizopuv-lataxe.pdf
    • http://dogalijun.scienceontheweb.net/is_padi_rescue_diver_hard.pdf
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/zuwapezuzanefa.pdf
    • http://zumigiguba.22web.org/50489271934.pdf
    • http://modozadubop.mywebcommunity.org/16373376348.pdf
    • http://texoraw.sportsontheweb.net/90174013899.pdf
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/7359579.pdf
    • http://bemuvubovewe.epizy.com/xeguruzegisujavurux.pdf

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