Malicious PDF — malware analysis report

Static analysis result for SHA-256 338cda95589dad65…

MALICIOUS

PDF

66.6 KB Created: 2021-03-18 09:17:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a3f3c04d056ae4ede4c3626ffb61e915 SHA-1: 5b9326c5e9adb550fb2dedebb81d9244d12e187c SHA-256: 338cda95589dad65504beab7f1d46eeedbc18fb82e983220905e2161b70cb8f2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9590

Heuristics 4

  • 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://baarspo.ru/aws?utm_term=the+difference+between+cats+and+dogs+funny+video PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425784/normal_603845e26e31d.pdfIn PDF document text
    • https://rebafanivine.weebly.com/uploads/1/3/6/0/136054257/xewalewivupabe.pdfIn PDF document text
    • https://roturusuwanowus.weebly.com/uploads/1/3/4/3/134363773/zifadutoxadabe.pdfIn PDF document text
    • https://mafaredoli.weebly.com/uploads/1/3/2/6/132695491/093d4c4c36609d.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/capture_one_12_manual.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/31506399447.pdfIn PDF document text
    • http://zifixoribe.scienceontheweb.net/mathematical_aptitude_questions_and_answers_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_600b441150d8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_600611449a775.pdfIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_95e2e6beadde49b18ff3347f10b2af47.pdf?index=trueIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_26861538d62047da86f9dd71e7ce8ce4.pdf?index=trueIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_1a9245239399434d81b4ffb1776994c1.pdf?index=trueIn PDF document text
    • http://tefetuzuzip.myartsonline.com/how_to_use_a_top_load_washer_without_agitator.pdfIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_f9c3360f18a54dd98863ea06cbf5c69d.pdf?index=trueIn PDF document text
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_6c7f75361a914e18b0f2948841a9d750.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d818d046-f3ad-4fd9-a47e-cf1c54cfb0e0/en130_english_composition_ii_assignment_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d1a34b-bad7-4426-b154-f231513a907d/how_to_fix_printhead_hp_8620.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_860eff4393bc4d418b3ef3ce429150da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6540ab3-1ed9-454d-b7f3-bef23087f778/que_significa_c_d_u_en_matematicas.pdfIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_781ae46fe4814b2084c845c89de5966b.pdf?index=trueIn PDF document text

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