Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09cc88c83b77370…

MALICIOUS

PDF

76.5 KB Created: 2021-05-03 12:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37be0be79f6f58b5e77ae14467cb0b32 SHA-1: 53714e11472e9bd25e53cc8210523e6a0a0d52c3 SHA-256: c09cc88c83b77370d2433cb4fc9cf7a4df3d7c8f3e95a7ae3b4f514afd39da4d
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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
  • 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://lozipotod.ru/strik?utm_term=cloud9+csgo+salary
    • https://cdn-cms.f-static.net/uploads/4415768/normal_601608147643d.pdf
    • http://majusenise.sportsontheweb.net/pipexulenuzuvatila.pdf
    • http://danifewikusi.scienceontheweb.net/algebra_formulas_free_download.pdf
    • http://zuxemesemubozo.mywebcommunity.org/20012850443.pdf
    • https://cdn-cms.f-static.net/uploads/4459177/normal_60372b9675ab3.pdf
    • http://xivazokib.medianewsonline.com/cardinal_dan_ordinal_number.pdf
    • https://cdn.sqhk.co/zoxunoromi/bPgfWhf/fupaximezemusidut.pdf
    • http://pumaguli.scienceontheweb.net/11720972561.pdf
    • https://cdn.sqhk.co/jagakutojut/fHv3hdB/go_cake_worms_long_island.pdf
    • https://cdn.sqhk.co/nexetifosam/shhJhhp/kulivoxapinegefit.pdf
    • http://lafowesezojo.scienceontheweb.net/69645199532.pdf
    • http://suxoxaxowigab.scienceontheweb.net/cocora_alvaro_mutis.pdf
    • https://cdn-cms.f-static.net/uploads/4421330/normal_6056042fdf2c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_3b34e2cbe42f474ba631c9538824cad5.pdf?index=true
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_4c38f36b176643aaaa9a85d5063f2462.pdf?index=true
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_de99fdb137ae4efd9c37eae8b2302618.pdf?index=true
    • http://zubiluwetij.myartsonline.com/75970967050.pdf
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_927bd39c9d6d416885d26b6ff6a11b3a.pdf?index=true
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_3ae30723fca34e9c9d441a4e29715395.pdf?index=true
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_e1cd49395ea846c2ac33b0d9e9008819.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea5.bin
a3e67bdb58273c51e3abd811aff275fff4c25b1f9e572388d46f48116dbb84d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 5272 bytes
font_01_sfnt_off000100a1.bin
58e2ce8227bacdb55f19b9dce29b19791d942a08d276e01ba7bd8ef38b160475		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 10236 bytes

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