Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d8afd58277521e…

MALICIOUS

PDF

72.3 KB Created: 2021-03-01 07:51:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c73e0b04d99d9bb02e6d4074a0eee71e SHA-1: 1685306533fe0c089487c0417facf0a5d2885e02 SHA-256: 73d8afd58277521edfe2519fc4f0956109af0d6dbb301ed605050f1f3877115d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://bologen.ru/123?utm_term=how+to+wire+a+draw-tite+brake+controller PDF link annotation
    • http://rugegav.mywebcommunity.org/hp_6700_printhead_missing_failed_or_incompatible.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/world_war_1_test.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/how_much_does_a_good_criminal_attorney_cost.pdfIn PDF document text
    • https://mojikusabuja.weebly.com/uploads/1/3/5/3/135301399/ziwasejo.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/jazupujuviwazowib.pdfIn PDF document text
    • https://ranezilipevag.weebly.com/uploads/1/3/5/3/135392607/919598.pdfIn PDF document text
    • http://unityfree.xyz/polk_audio_psw505_amplifier_repairhoacs.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/54991562277.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474220/normal_5fcfeba882325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_6011e1b345f84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468836/normal_5ff3f7309faf4.pdfIn PDF document text
    • https://kukibutojiw.weebly.com/uploads/1/3/0/7/130775835/4715951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501198/normal_600247562da23.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/taguxif/texas_jurisprudence_exam_lpc_study_guide.pdfIn PDF document text
    • http://mukanebesiva.atwebpages.com/where_to_learn_photography_in_lagos.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/venuxirorenux.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/coast_guard_gar_model_orm.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/60196486162.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/welajonafokojamanedabawib.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE80 4832 bytes
SHA-256: 7efa1a57c574f898fd5829ef2adec4143386d74b17b73ee77bcc04b1e0aca976
font_01_sfnt_off0000df03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF03 10928 bytes
SHA-256: 9ab3c5bf7ecd67fab11fe919dec1707e45e2436480349342d30abf53d7629356
font_02_sfnt_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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