Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c4957a05258b3a…

MALICIOUS

PDF

88.1 KB Created: 2021-02-16 07:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 140ff8db06da9cef617066ccb06e203d SHA-1: 9482b1eff8243821659ed5ba2c0be06c499e511e SHA-256: a6c4957a05258b3ab14950c25d28d2d08089bc2277d95e2f21cbabea3f792ada
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. ClamAV and ML classifiers flagged this as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious or deceptive content.

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://bologen.ru/strik?utm_term=how+to+clean+kenmore+sewing+machine PDF link annotation
    • https://cdn.sqhk.co/tijatabov/jgijUmM/buburefat.pdfIn PDF document text
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/61443cfa0f17f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392877/normal_5ff3ecda9227f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_60280836b98d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489414/normal_5feb54ee5e545.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/iejbihx/goduwagamupifalame.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/iJlibpZ/kart_racing_suit_requirements.pdfIn PDF document text
    • https://kokopepexepu.weebly.com/uploads/1/3/1/3/131379351/pamusom.pdfIn PDF document text
    • https://pivatebovuwize.weebly.com/uploads/1/3/0/7/130775292/toxemat.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopivosoba/cOLS6XO/51492074462.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/gPClic0/18719522445.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/8625222.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://daxajokawutuv.rf.gd/cisco_aci_configuration_guide_2._3.pdfIn PDF document text
    • http://faxiwig.epizy.com/top_10_problem_solving_games_for_android.pdfIn PDF document text
    • http://vizepojuduw.rf.gd/full_block_form_letter_example.pdfIn 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_off00011bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 5332 bytes
SHA-256: 15731a70194e63d3179bcae710af0ac6d47b1f8e391abdd9c5e204cc4667d59b
font_01_sfnt_off00012dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC8 11000 bytes
SHA-256: 85053a4c84b6d189f63ce666cc5915a622357b96b02731644d468ed56d7f6010

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