Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d47c12fc41b342…

MALICIOUS

PDF

102.3 KB Created: 2021-06-06 06:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 069b10d0b7ade266be849e35d4ccb59e SHA-1: f6b02bd9b1d9a8e8435be50fb2c9ed3f45d3dc5c SHA-256: a7d47c12fc41b342dfa495c304d057c71c447f70d49ffb49c9bd809834b79acb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=leer+cuento+un+viaje+de+vacaciones+de+roger+par%25C3%25A9 PDF link annotation
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/8801825.pdfIn PDF document text
    • https://tolafapod.weebly.com/uploads/1/3/4/4/134486806/rojozubuxerofurigu.pdfIn PDF document text
    • https://nerefowat.weebly.com/uploads/1/3/4/8/134856831/dijep.pdfIn PDF document text
    • https://gitokivoj.weebly.com/uploads/1/3/4/3/134316846/madesuxegil.pdfIn PDF document text
    • https://xobijuveja.weebly.com/uploads/1/3/1/6/131606615/tagutinano_jawuxi.pdfIn PDF document text
    • https://lirodenagegoket.weebly.com/uploads/1/3/1/4/131437677/jofavajizi_gomowogonulizal_dobuvegegetope.pdfIn PDF document text
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/9310267.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/af946fb5ee9.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/3ed2c8bc-5e2d-4431-8229-f35a1f914753/tuwegozoxukemidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/985f40fc-456b-453c-8a1a-bf77a9377fa1/small_unit_leader_tactical_handbook.pdfIn PDF document text
    • http://jabodawo.pbworks.com/f/is_pokemon_ultra_shiny_gold_sigma_complete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0e153b-15eb-4566-9f44-e3a28037972e/12304834478.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/f/55602479517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2f00055-f24d-404a-bdb7-a46b73da4854/sejuxewom.pdfIn PDF document text
    • http://didaneguk.pbworks.com/f/12803274281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f34fd63d-4033-4cf0-841e-5f9f8d5b9e35/69743377133.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/f/digital_marketing_strategy_plan_template.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/f/75300475460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a736292e-f96c-4fc1-950e-19bab5740c36/how_to_make_a_dialectical_journal.pdfIn PDF document text
    • http://xetuduju.pbworks.com/f/figuras_en_un_plano_cartesiano_con_coordenadas.pdfIn PDF document text
    • http://nixefijevumu.pbworks.com/f/nivefokux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f82fbaf1-3f1d-4d64-8755-bf04e8733543/temperate_woodland_and_shrubland_abiotic_factors.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_off00014cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD9 5428 bytes
SHA-256: 21e5e3efcc297299dba2f091c14665f9bf1f829c038057c378feaee8bb4a3d87
font_01_sfnt_off00015f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F2D 14048 bytes
SHA-256: d02b9c69a243f3774a8c21d185f80af5e361d1a7a5bcbba469c27d5a37919d26