Malicious PDF — malware analysis report

Static analysis result for SHA-256 746b9e322f6c1353…

MALICIOUS

PDF

81.0 KB Created: 2021-04-17 04:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3103be6d336630c9345b0ccf86952e18 SHA-1: 2ec339805c109ba604e00ea0101512951f420615 SHA-256: 746b9e322f6c13533d30494cb2f1461e51ed9a00d95aa45f89df165c6eba0420
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to various websites, including one with a 'utm_term' parameter suggesting tracking or phishing. While no scripts were explicitly extracted, the PDF structure and the presence of external links are consistent with techniques used to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=simple+beginner+core+exercises PDF link annotation
    • http://rijewomel.scienceontheweb.net/neverending_story_dragon_name_pronunciation.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/british_english_grammar_by_ak_singh.pdfIn PDF document text
    • http://help-copyrightservice.xyz/bodyweight_ab_exercise_bodybuildingm8s5f.pdfIn PDF document text
    • http://zavodtriumf.com/47067122542vl1in.pdfIn PDF document text
    • http://lamovingcompany.com/buwikejiwusekxub8.pdfIn PDF document text
    • http://salearea.pro/27721231231n7sqi.pdfIn PDF document text
    • http://spoonnumberone.xyz/basafikibukiwubagegqj0o6.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/574c29e28bd3d20.pdfIn PDF document text
    • https://ripapexogona.weebly.com/uploads/1/3/0/8/130874469/muluxujurulafe.pdfIn PDF document text
    • http://nogeturafo.sportsontheweb.net/60863135410.pdfIn PDF document text
    • http://investorlands.ru/when_did_islamic_architecture_startsogfa.pdfIn PDF document text
    • https://vafobuzegigotot.weebly.com/uploads/1/3/0/7/130775214/4292903.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5eb1f58-1fac-4b40-9633-6ff50dee37fe/how_much_does_an_aws_certification_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac2f77e6-1cb9-4fcb-b8cb-bcb51e89d9eb/jemininejarosefogas.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/ielts_test_report_form_british_council.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/154b766f-5c0c-44b4-a479-db6c144696a0/how_do_you_reset_an_lg_air_conditioner.pdfIn PDF document text
    • http://fetekovabu.onlinewebshop.net/burnaby_north_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e2be7c-9bae-4220-a2a6-bb629d462915/57799938874.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/life_skills_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/how_to_dark_mode_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/jufaxukolezodugufavajesi.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/html_website_templates_for_business.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_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 5352 bytes
SHA-256: 9afde63c81f5d0e57ff85b6c511e010c8b87c76793b3fd6e3a71b394b2b9aa48
font_01_sfnt_off00011267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 10620 bytes
SHA-256: e5d3669e79290ed87faa761d612f8b4e2dc435c943e65a1f649948a874bdd159