Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bcddc55b6bb7c8…

MALICIOUS

PDF

71.7 KB Created: 2021-01-25 13:54:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: e4591875b65314a23b163385fdc9cd47 SHA-1: cca86204424088cb23394be22074835758db2337 SHA-256: 91bcddc55b6bb7c8934b01fe6efd309eb3e2f4859cd4433c3e3ef20a364cc016
186 Risk Score

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://seumenha.ru/aws?utm_term=essential+english+grammar+rules+pdf PDF link annotation
    • https://tadesurirow.weebly.com/uploads/1/3/2/7/132711952/3275cf16561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_600b71e589539.pdfIn PDF document text
    • https://cdn.sqhk.co/bomunerafoju/jajbjjl/3525209781.pdfIn PDF document text
    • https://vumopofusub.weebly.com/uploads/1/3/0/8/130874587/nekitilazukof.pdfIn PDF document text
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/lipisolekaf.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/7YBggze/puzzle_bubble_game_two_players.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_5fe6766fd1717.pdfIn PDF document text
    • http://fufexak.22web.org/sawav.pdfIn PDF document text
    • https://gatepeduvemixif.weebly.com/uploads/1/3/4/6/134669895/1271438.pdfIn PDF document text
    • https://zedowegekinusil.weebly.com/uploads/1/3/3/9/133997302/japowogigirero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478398/normal_5fd89b63237d9.pdfIn PDF document text
    • https://cdn.sqhk.co/wutalididow/heghhZ1/55460746638.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/ditizavekeb.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/jggcejd/best_tile_spacing_for_shower_wall.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413244/normal_5fe338190cf63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juxudawalugevop.epizy.com/vilibimexosozigalenek.pdfIn PDF document text
    • http://gojaxuga.epizy.com/tokyo_guidelines_for_cholecystitis.pdfIn PDF document text
    • http://romezegipoxo.epizy.com/hotstar_apk_uptodown.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_off0000dbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 5412 bytes
SHA-256: bd1d50328c865905f4515ef7b0b9ea4b799251f34fa4d353c3797372f410cbfc
font_01_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 10468 bytes
SHA-256: e5aa1f55ddf6d23b0ecf6f847301f710786e8015304e146254fe1b4f658b8ec8

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