Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfc2c1c6ed66c0a…

MALICIOUS

PDF

86.1 KB Created: 2021-03-23 05:24:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 08bf04ca2b36c330576e2b1c71e4685b SHA-1: 5278e03520914379f6d0c2155e9e26b42b93caf2 SHA-256: 9dfc2c1c6ed66c0a87ede8bf3051abedad5c676a268a90e7da93d0ce07b436c3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9998

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://xajibur.ru/award?keyword=ncert+class+12+biology+book+solution+pdf+download PDF link annotation
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/0e6f794.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/ichjqia/gofojebewurakodoxoka.pdfIn PDF document text
    • https://cdn.sqhk.co/navuwamas/C13hLgf/3760685993.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/2585926.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/jdhbEhh/shogun_express_fairview_avenue.pdfIn PDF document text
    • https://cdn.sqhk.co/fosigigamef/Tpha1hd/osprey_complete_retro_plastic_mini_cruiser_skateboard.pdfIn PDF document text
    • http://ihsteam.ru/gafipiv2bc2.pdfIn PDF document text
    • https://tunedewujanan.weebly.com/uploads/1/3/5/3/135345761/lejiribubip.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/cloud_brushes_for_photoshop_cc_free2r4vf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_afe8e14f17504d678053f3ce0bc94f2d.pdf?index=trueIn PDF document text
    • https://d1b6b380-f15b-462b-86b5-0b089ba7d90d.filesusr.com/ugd/f99a33_fa23ed7f76c54461888612b44a75e47c.pdf?index=trueIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_f51fc5ba97ce41a790df6e864357a829.pdf?index=trueIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_9f59537fbf3a42419fa547e6339a5312.pdf?index=trueIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_e7f494a5636748008c4256c0d4ec3615.pdf?index=trueIn PDF document text
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_d467c107e3ef4d689f88852a41941ab2.pdf?index=trueIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_1f9b113954f3436088c4438dc90f6ac5.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_0a8641be6e4045749d75b4637b121269.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 5872 bytes
SHA-256: 438a12aa01fda81b884503aa648dd9b4b0431a03bb557dafe552db0e13c9fd63
font_01_sfnt_off0001261c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261C 10920 bytes
SHA-256: 8e5e40d194356005a62e13b0a6faa6f6e806247ccc649bedd8ce578186909e1b

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