Malicious PDF — malware analysis report

Static analysis result for SHA-256 30840df452d69c4c…

MALICIOUS

PDF

90.6 KB Created: 2021-04-30 23:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0c9a46853770b8947cc5371b0052c447 SHA-1: 19c97a642223519897408ef3f241ef4f9586bf86 SHA-256: 30840df452d69c4c1244b39da0a616b419b2a8f0067bec65c75f015c1fe488da
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with one primary URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to potentially harmful content.

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://kuzutuzo.ru/strik?utm_term=youtube+australian+wild+dogs+7+little+words PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448115/normal_6013dee7c2124.pdfIn PDF document text
    • http://gegebafebofad.scienceontheweb.net/how_to_use_a_kitchenaid_microwave_convection_oven.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470532/normal_606300387c684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5fe6401c787e8.pdfIn PDF document text
    • http://tiriruno.sportsontheweb.net/4420945588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_6057cbc65a69c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_6029f40199461.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465908/normal_5fffeb7ce43f9.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwevini/sghgjvn/nulefuponem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_603ff403e9f52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481286/normal_606df3afe9710.pdfIn PDF document text
    • https://cdn.sqhk.co/favosejo/h8hajgt/saxepo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446650/normal_6003fbb9e5e3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366367/normal_5fc63c8ab4b02.pdfIn PDF document text
    • http://lijonotogi.scienceontheweb.net/adjectives_prepositions_exercises.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_ed70b0363aad4eb39613bed5844d49a5.pdf?index=trueIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_f61688fe59b4496b8cbc2ba51da73a15.pdf?index=trueIn PDF document text
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_3cc6859b30ec4e998ce9ff90a2f9fdbf.pdf?index=trueIn PDF document text
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_ea7d74d026664041899dafb7c598d9cf.pdf?index=trueIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_89625f12ffe2403cbaad306ec4eb78d7.pdf?index=trueIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_8cf87a74c028437bbb3e07e8a747abe9.pdf?index=trueIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_9523f64d8d77427692ec8711bc65ee4d.pdf?index=trueIn 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_off000123c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C9 5264 bytes
SHA-256: 5167c5e556fa7ea735cd5d63d919a1bf3d2aa609426232287b0c135bff425360
font_01_sfnt_off000135d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D6 11524 bytes
SHA-256: 3213673529d3658682f07d2e56a3a9a64fea9ac37ce60536216334a0993c3135