Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85e80857dd560ad…

MALICIOUS

PDF

76.3 KB Created: 2021-03-11 17:34:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8a759fa3cb34501414e2e85d53b63448 SHA-1: 82b6c6ac3361e2d4c94806e137b82424cf3ef287 SHA-256: f85e80857dd560ad0223e4e727b2b5903246756c5aaed26fc8ed592edb736f9d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=falcon+crest+theme+sheet+music PDF link annotation
    • http://ses-paypal.com/47999764468dx7wo.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/Zjh9cih/46198893729.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/6749270.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/ijoxjhb/29114592511.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/6OZE6ej/movistar_team_shop.pdfIn PDF document text
    • http://lizakoku.22web.org/62417030806.pdfIn PDF document text
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/daribixa-gasoweni-gufijidaji-vaxutaxasuzos.pdfIn PDF document text
    • https://fapudunaga.weebly.com/uploads/1/3/0/7/130776769/449b884093.pdfIn PDF document text
    • https://jebezijako.weebly.com/uploads/1/3/5/9/135964749/84496d9.pdfIn PDF document text
    • https://tajuwelaf.weebly.com/uploads/1/3/1/0/131071184/8760916.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/jchcAf8/city_taxi_driving_simulator_pvp_cab_games_2020.pdfIn PDF document text
    • https://davovexo.weebly.com/uploads/1/3/4/3/134355956/digafogog.pdfIn PDF document text
    • http://carishr.com/hp_deskjet_2545_printerte146.pdfIn PDF document text
    • https://zitidifomeki.weebly.com/uploads/1/3/1/4/131412181/4768839.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/chgpgFb/litagododaza.pdfIn PDF document text
    • https://resevaguwitim.weebly.com/uploads/1/3/5/2/135298688/fe52441.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/robumuduluwise/administracion_de_los_canales_de_distribucion.pdfIn PDF document text
    • http://luzusimunire.rf.gd/76192124398.pdfIn PDF document text
    • http://gimuluma.epizy.com/30884864624.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/ladezivorapabevud.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_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 4992 bytes
SHA-256: 33275581e5a127d4f5e8ed610ff353a0b9e371830f3d3f122edf1dcd41e6ec5a
font_01_sfnt_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 10736 bytes
SHA-256: 6922c5ce0f6d8418851d4aedba27d9cf130b23723516a835c43e4574976bb4ba

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