Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f57e4ba1fc41d21…

MALICIOUS

PDF

74.5 KB Created: 2021-02-02 06:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: efdc0930bef7bca7bb14180c4f4eb7f6 SHA-1: 9eab476e833504c92ff6ed86c0534709f5ca9521 SHA-256: 5f57e4ba1fc41d217ff286eb6fb130474f50c1ed1f22915b2493289608c4aa94
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a spearphishing attachment delivery mechanism.

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://druttle.ru/123?utm_term=skytweak+for+fallout+4 PDF link annotation
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/gidin-kamolapigu-wigotivetelavu-jefowun.pdfIn PDF document text
    • https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/1ea461771.pdfIn PDF document text
    • https://mefiwoteta.weebly.com/uploads/1/3/5/9/135956645/2299993.pdfIn PDF document text
    • http://polfact.site/rewopexedeka2s37b.pdfIn PDF document text
    • https://kelesive.weebly.com/uploads/1/3/0/8/130874426/tegufonujeki.pdfIn PDF document text
    • https://fijomenameti.weebly.com/uploads/1/3/0/8/130874411/kebomo-sorelijusuw.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/hoverboard_simulator_robloxmm7ss.pdfIn PDF document text
    • http://igme.site/i_wish_you_were_here_movie_zach_braff73ed1.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/photo_editor_collage_maker_pro_apkpurem9at4.pdfIn PDF document text
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/2360941.pdfIn PDF document text
    • https://bitiwinelezom.weebly.com/uploads/1/3/1/8/131856531/lubuvefa.pdfIn PDF document text
    • http://im-marceting.site/geetika_khanna_bhattacharyacyrx9.pdfIn PDF document text
    • https://voxepobar.weebly.com/uploads/1/3/4/6/134668427/3fedf91d4e9092.pdfIn PDF document text
    • https://katalulipof.weebly.com/uploads/1/3/2/7/132710678/45a974.pdfIn PDF document text
    • http://goldstein.capital/oriental_adventures_3.5kx2ae.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/jifedefujodu/adjectives_form_of_cold.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 5032 bytes
SHA-256: 56ddf6800e22968fe04624fb19fada479a55430c4df8179335562f26f7d621a9
font_01_sfnt_off0000f768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 11216 bytes
SHA-256: a9a978b4abdfa1a23915d0c6ec9e534445a9bfd185c9473bcc95cce3254224a3

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