Malicious PDF — malware analysis report

Static analysis result for SHA-256 6079ab0953e54cb2…

MALICIOUS

PDF

68.0 KB Created: 2021-06-09 00:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0045c0abd751005ea757beb24497d5b9 SHA-1: 7c338ccf394f01d6815e9f6a575b2ad6b08c0578 SHA-256: 6079ab0953e54cb24eb9a14ec56d95b10a074b53452639fd12205457d23bf9ac
126 Risk Score

Malware Insights

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

This PDF document was identified as malicious by an ML classifier. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://infrive.ru/pbw?utm_term=brokeback+mountain+123movies, is directly embedded. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a high likelihood of malicious intent related to redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/pbw?utm_term=brokeback+mountain+123movies PDF link annotation
    • https://kijadixuzot.weebly.com/uploads/1/3/4/5/134585523/kobetasob_tufijonepos.pdfIn PDF document text
    • https://gokaraxonupesi.weebly.com/uploads/1/3/4/4/134468062/2007278.pdfIn PDF document text
    • https://kadutazufe.weebly.com/uploads/1/3/4/6/134639852/539644.pdfIn PDF document text
    • https://kavivafome.weebly.com/uploads/1/3/2/7/132740637/4559d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475863/normal_5fe1b9c9d8c1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_606aeb4a4527e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_6015948a62b10.pdfIn PDF document text
    • https://zitakutuseg.weebly.com/uploads/1/3/5/9/135994262/roletu.pdfIn PDF document text
    • https://gubanezuwibudo.weebly.com/uploads/1/3/1/6/131606890/siwuwanidifumo_xinelineva_bemige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408463/normal_6011436ea80f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393755/normal_601dc24c10f72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413011/normal_606bcf573fe6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493227/normal_5ff543b35b2c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461767/normal_605100d158eaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415046/normal_5ff9dfe4a29e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144812955/83486084525.pdfIn PDF document text
    • http://molitutolu.pbworks.com/w/file/fetch/144558036/present_simple_vs_present_continuous_exercises_upper_intermediate_level.pdfIn PDF document text
    • http://natutaliva.pbworks.com/f/creating_design_document_in_software_engineering.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/tony_robbins_awaken_the_giant_within_book.pdfIn PDF document text
    • http://nigezid.pbworks.com/f/engcon_ec219_for_sale.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_off0000cc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9A 5572 bytes
SHA-256: 1f565b3987f45bbb550d78efa74378abde7a02a3b2526cd4f9a172ba76aabdee
font_01_sfnt_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 10320 bytes
SHA-256: 313c0ae56436303aebe3ef58edc583f6a8b78dc929150695130ecd0d1486f5fd