Malicious PDF — malware analysis report

Static analysis result for SHA-256 6280234e4111f57b…

MALICIOUS

PDF

73.3 KB Created: 2021-06-01 23:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4ab92c001071a4251afe7560af417137 SHA-1: 47e30dc27237815cad2a06c3287bbef1fe347ac3 SHA-256: 6280234e4111f57b880f8636f3c1ebeb11bb59ec32a50ec128a904e7390e369a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a campaign designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://catamma.ru/pbw?utm_term=how+to+get+minecraft+1.17 PDF link annotation
    • https://fasuwilobavofe.weebly.com/uploads/1/3/4/4/134489762/kejoxadalufegum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393514/normal_5ff7f40757801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_606776b1d5108.pdfIn PDF document text
    • https://lezojefob.weebly.com/uploads/1/3/5/3/135319065/2320433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393785/normal_600fb9b7c3af0.pdfIn PDF document text
    • https://regenapewafixun.weebly.com/uploads/1/3/4/3/134364718/wedukugedari-kogujezozezoz-momumukikiror-zudogojonoxan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_606e9fe3a976a.pdfIn PDF document text
    • https://xazupuve.weebly.com/uploads/1/3/4/8/134863790/989123.pdfIn PDF document text
    • https://venubitolaxi.weebly.com/uploads/1/3/4/3/134372432/2077730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_601e979c2c8e1.pdfIn PDF document text
    • https://lenagalazipanom.weebly.com/uploads/1/3/5/3/135310064/dcfb10ca8.pdfIn PDF document text
    • https://kokopepexepu.weebly.com/uploads/1/3/1/3/131379351/304a2805725c.pdfIn PDF document text
    • https://soramaliduf.weebly.com/uploads/1/3/4/7/134716182/fokuvux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_600dc282a212b.pdfIn PDF document text
    • https://ruzisatof.weebly.com/uploads/1/3/4/7/134734885/0accb8dbcbb6ebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447646/normal_5ff382cf3683e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_5fdb5635a2d05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_606a915d2ff2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_5fd3a5fa6c297.pdfIn PDF document text
    • https://raxasowofano.weebly.com/uploads/1/3/2/6/132681821/niwib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kufujibumufa.pbworks.com/f/63484349187.pdfIn PDF document text
    • http://xodelow.pbworks.com/w/file/fetch/144452136/why_corporal_punishment_should_not_be_banned.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_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 5208 bytes
SHA-256: 42964bbfbd0c0dc974eb5d8a701993ddc892e5a541384da08eedb2ba3d52a981
font_01_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 10520 bytes
SHA-256: 298ca9e9963032e2d9e4b425e5bb3ef0e7a71ffb9225291044a94767151c9818