Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81812d85cfb5f12…

MALICIOUS

PDF

87.9 KB Created: 2021-03-18 00:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fc5fdc350eb73101ecef59a232191dad SHA-1: d53f989658255f2c2a7f86a03680272031709c72 SHA-256: c81812d85cfb5f12d0e1205f469f68a3c9f06d09975ab47ee5cf4f9f38a901cb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

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://xezojetit.ru/strik?utm_term=wordpress+hosting+free+theme PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474211/normal_5ff2a1a81ef38.pdfIn PDF document text
    • http://yourcy.com/garmin_nvi_55_lmt_update_kostenlosa28p2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_60294b51049ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_5fd0e69f14e75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421461/normal_5ff9a78cbe88c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489713/normal_604f0749ad3d6.pdfIn PDF document text
    • http://arnautmebel.ru/dyson_animal_ball_vacuum_not_suctioninguipab.pdfIn PDF document text
    • http://sigefolaxapuve.22web.org/controle_da_administrao_pblica_estrategia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_6031871a7e526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389816/normal_6039499e5ec2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a26c5f8-c4f8-4af8-830b-7e2c9961bd8e.filesusr.com/ugd/2e4362_953c512b87c2431490eaf41d0ab58228.pdf?index=trueIn PDF document text
    • http://newabef.rf.gd/pumurimijikoritexidilif.pdfIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_e9e5498318eb468f856b4360596712e3.pdf?index=trueIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_b506fac9f78a4fb3979f62d5d7148d26.pdf?index=trueIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_ca038cb176304e69b7805804214f2d48.pdf?index=trueIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_07d85813046b46479ff79cbe7c298ffd.pdf?index=trueIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_ec46e6d54a5f49b18fcaebf47185d35d.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_1812c1898edf41dd9130667bdaf3308e.pdf?index=trueIn PDF document text
    • http://pukafenofi.epizy.com/tawaxovebuduvufun.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_368eebb4950941008a2e1ee3198e481f.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_off00011a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6D 5228 bytes
SHA-256: 9c925dd05d72590c61a4c330d7ed06655de7306643147974e8cfe365364d7799
font_01_sfnt_off00012c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C20 11432 bytes
SHA-256: 920b53df725cd66f00797801d4c631289a6f659de275aab86b478459955fe92a

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