Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc94c5d827dd7307…

MALICIOUS

PDF

77.2 KB Created: 2021-03-01 05:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 661682904a9c27fc3ffe20682b1be4c8 SHA-1: 38b4efdf03a9ae0dbd2e5a9758d61c2d6e5c2b77 SHA-256: cc94c5d827dd7307ea50e30f22d8f2fde1e0ed4347313df82caa6883c29cd67f
166 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains multiple heuristics indicating suspicious links, including invisible ones, that redirect to external domains. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The primary attack pattern involves luring users through these links to potentially malicious sites.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://pelibifir.ru/strik?utm_term=what+to+ask+when+buying+a+retail+business PDF link annotation
    • http://sodahub.pro/aquarium_deluxe_game_free23t41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446636/normal_5fe86437ada33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474723/normal_5fd3bba71657f.pdfIn PDF document text
    • http://aydym.club/dd_5e_campaign_levelst2sz2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479224/normal_603c5961f0f7f.pdfIn PDF document text
    • http://cherrypimp.online/julosuvekm7pjv.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/briggs_and_stratton_engine_instruction_book.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/liftmaster_la500_gate_opener_reviews.pdfIn PDF document text
    • http://feelslike35.com/motomizipubemejipofef5j4g.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/551117227448r0au.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449012/normal_6039fb574dfeb.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/qigong_breathing_techniques.pdfIn PDF document text
    • http://shtangye.xyz/used_naa_ford_tractor_parts_on_ebay0qc9h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pagikojezokatu.rf.gd/gewamimobomus.pdfIn PDF document text
    • http://felakaselik.epizy.com/87426104511.pdfIn PDF document text
    • http://vavegigodal.epizy.com/27421270603.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/36554670912.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_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 5360 bytes
SHA-256: 603336b39a137fd4b43d7ed992780a62d7e2655e98dd5297480a949dd31189b3
font_01_sfnt_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 11244 bytes
SHA-256: a5bdf9a82c37dc8d7dd1d0ebe95eef3e96d6784b988cdbe76814844206d46f06

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