Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc687d9ad8bfb78…

MALICIOUS

PDF

90.0 KB Created: 2021-03-10 04:49:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fae378e054a8def9bc8f7948c2633bc2 SHA-1: 780fc24182e6fca46420c1415e014b6f0898570d SHA-256: efc687d9ad8bfb785d6fffef2df11332cef84075af0edd0d345ac7ca2ac99e01
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9323

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/award?keyword=pharmaceutical+inorganic+chemistry+lecture+notes+pdf PDF link annotation
    • https://mexupapomumag.weebly.com/uploads/1/3/0/7/130775103/8996241.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/nrnuij8/animal_coloring_pages_for_adults_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/xafazunusa/hPgggga/xodejisolu.pdfIn PDF document text
    • https://xadamunakufadi.weebly.com/uploads/1/3/3/9/133986396/vizulafibi-lexaninez.pdfIn PDF document text
    • http://sumemejosanavo.iblogger.org/iron_man_face_template_for_cake.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/cft6lss/gegorimuro.pdfIn PDF document text
    • http://tesepaxe.iblogger.org/68335658130.pdfIn PDF document text
    • https://cdn.sqhk.co/lijedubejop/YUiUchd/53477066620.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/73c1ea82ba6c.pdfIn PDF document text
    • https://cdn.sqhk.co/zodenizekija/NNL7tja/rush_full_hollywood_movie_download.pdfIn PDF document text
    • http://fivokuje.iblogger.org/bernard_mandeville_la_fabula_de_las_abejas.pdfIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_0ed6abed7e194ba98edcbe209203bbd7.pdf?index=trueIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_88e1676146464572a1bedca32c7ca4f9.pdf?index=trueIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_9bd7ec67064f45668afc01104be0b2e9.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_8b04f2927c16454599ec5406d6bc85c2.pdf?index=trueIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_21c152c658db49c096ee077ef2e7e4d0.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_64682cce770441a2b2050ca6aae9bc3f.pdf?index=trueIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_f2e726e5e09f408190c2791cef501211.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_08fbd119a77c450f9298103327da09d9.pdf?index=trueIn PDF document text

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