Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cc7b651177b0d0…

MALICIOUS

PDF

95.3 KB Created: 2021-02-24 02:02:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b3e6b4cc0c9e7eb98b677c8166c29e1e SHA-1: 85cfd60b76d33d4d0ebf063b07e81f0794cb44ef SHA-256: 38cc7b651177b0d03eefc9d0b6fd96ed2db03a62f0d798a15c7f259014b55472
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains or link farms. The primary malicious URL identified is https://seumenha.ru/123, which likely serves as a lure for phishing or malware distribution.

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://seumenha.ru/123?utm_term=cfa+program+curriculum+2020+level+i+pdf PDF link annotation
    • https://baxomowimesadud.weebly.com/uploads/1/3/5/3/135303612/degonu.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/wadosuvomipem.pdfIn PDF document text
    • http://gmetry.online/capitalism_socialism_and_democracy_1942w71qw.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/jdifjgi/lazaburaribiten.pdfIn PDF document text
    • http://intereriia.com/disneyland_paris_tickets_2021s03n7.pdfIn PDF document text
    • https://bezofaxifi.weebly.com/uploads/1/3/1/6/131606652/6c44d727fb5f2.pdfIn PDF document text
    • http://wapajojakazewi.iblogger.org/88737196670.pdfIn PDF document text
    • https://cdn.sqhk.co/javepuju/ajgRKgg/get_free_cell_c_airtime_now.pdfIn PDF document text
    • http://mebel-albero.ru/fmovies_to_mp4_er22byr.pdfIn PDF document text
    • http://trellos.fun/48437524230qy20e.pdfIn PDF document text
    • http://ersoil.fun/156998844f6y5h.pdfIn PDF document text
    • http://lnstagramsupportlives.com/will_cortisone_shot_help_tennis_elbowekt3f.pdfIn PDF document text
    • http://misstourist.info/connotation_denotation_euphemism_worksheet_answersbk0sx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rufonali/fesisunilutivole.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/bhojpuri_hot_video_song_2018_dj.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/infinity_pool_design_guidelines.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_off00013564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13564 5536 bytes
SHA-256: 418cc58c72f4525184e333fd67db16aef38f3cb9fa0c0ee80cc9311ca61c52cb
font_01_sfnt_off00014830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14830 11336 bytes
SHA-256: 38d2d36313092bdb55b9d39562be9bf550d0f650533403229a7ea83c9868862c

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