Malicious PDF — malware analysis report

Static analysis result for SHA-256 283c59b2592f173d…

MALICIOUS

PDF

75.7 KB Created: 2021-01-25 16:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3ff63a6592202eb71ab662525a71a2ec SHA-1: b9a9bc03b52d36d11873fa2d0213bb01735123f5 SHA-256: 283c59b2592f173df3074f8fd30c848146f95925872b30cdc0b765a35330a845
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious campaign.

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/123?utm_term=shooting+bench+plans+dimensions PDF link annotation
    • https://vafopizinenited.weebly.com/uploads/1/3/4/4/134480139/adef9ae53f89b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385011/normal_5fdeb1b697734.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/iaupSZw/26862555304.pdfIn PDF document text
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/ribekipum.pdfIn PDF document text
    • https://revabusabozuvum.weebly.com/uploads/1/3/5/3/135398016/2518124.pdfIn PDF document text
    • https://wosixuluwur.weebly.com/uploads/1/3/1/0/131071196/3acac6519.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465386/normal_5feebe63d2974.pdfIn PDF document text
    • http://ig-copyrightnotice.com/gardenscapes_mansion_makeover_app_storeib7dm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496616/normal_5fd27462edd55.pdfIn PDF document text
    • https://fajesafopumusid.weebly.com/uploads/1/3/1/8/131871419/85911d3bb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402503/normal_5ffececff3bc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405197/normal_5fd3469a7b6c2.pdfIn PDF document text
    • http://indonesia2health.online/f1_ps_game8t204.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/ictha59/pusezajaziraf.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/ggiegjn/kisiwafarofajevi.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/livivuvuwugeb/69417277431.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/74431698213.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_off0000e84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 5636 bytes
SHA-256: 7c9b3d3e0498d9d526a97b812d96c5262cc96f1f32870b5e5d8e5dca4cde9282
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 11444 bytes
SHA-256: d828920c5acc126268485ae637fef6a42ea6c418de999c9b8f2c4f8bf17e9d90

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