Malicious PDF — malware analysis report

Static analysis result for SHA-256 6faf26027b8e0cf7…

MALICIOUS

PDF

101.5 KB Created: 2021-03-22 21:22:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 62e6d9d231942f2a358186f6463267cb SHA-1: 07f27ff4cde565e85e2b154a8ca8a3915ebccfae SHA-256: 6faf26027b8e0cf76655d1066a303b044ad0085bfc04945645843d430cd9b9ab
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://soxebez.ru/strik?utm_term=the+easy+way+to+quit+smoking+summary PDF link annotation
    • https://barosowuni.weebly.com/uploads/1/3/1/3/131398377/9319548.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/a3ia8jg/gewiwibebaroni.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/ZARYgjC/imo_free_video_call_app_for_laptop.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/hdjdiir/14625263900.pdfIn PDF document text
    • https://cdn.sqhk.co/laripikiwafo/kPgiBeZ/zizivoraropoxafov.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/bjdz8ha/life_after_game_download_highly_compressed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496402/normal_6035e070f3241.pdfIn PDF document text
    • http://zakababonedip.iblogger.org/elementary_general_music_lesson_plan_template.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/87291192106kh3zn.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/KjdtiiS/3968922748.pdfIn PDF document text
    • http://drilltech.info/email_verifier_full_cracki9uit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366382/normal_5fe3a007c68ce.pdfIn PDF document text
    • http://maddot.space/secrets_of_underground_medicine_bookh4fhc.pdfIn PDF document text
    • https://bigadamedoje.weebly.com/uploads/1/3/1/3/131384249/suzit.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/ehhiWgi/divukijef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxovexewudo.epizy.com/worksheet_15_calculating_average_speed_distance_and_time.pdfIn PDF document text
    • http://vukilef.rf.gd/sosesanesurakidutasom.pdfIn PDF document text
    • http://wetedezowob.rf.gd/reliability_centered_maintenance_moubray.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_off00014fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FBB 5400 bytes
SHA-256: 12cb4ee5ba31dd26430bcb04c0681b8064d79fb0005051a218a4a74e5c60690f
font_01_sfnt_off0001620a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1620A 11184 bytes
SHA-256: 2d83f90d8820fc97005938e53af6a81c8a5b2c8d63bc709385b7dc2a13695db5

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