Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a58791f8eeed74…

MALICIOUS

PDF

62.7 KB Created: 2020-11-25 06:15:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1c6d780aeb0e0a3f7cfb234ff3bbc48a SHA-1: 26777786e1b33921e9c529385f7040dc358bc3b2 SHA-256: f8a58791f8eeed74eb2912df2e80f61409e6050cb141233b4670b14d1a50c610
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 pointing to disposable hosting services, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://trafficel.ru/strik?utm_term=linear+algebra+ron+larson+slader', are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/strik?utm_term=linear+algebra+ron+larson+slader PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387819/normal_5fba71e8205d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470038/normal_5fb7974b54d58.pdfIn PDF document text
    • https://vewewiganivobob.weebly.com/uploads/1/3/4/8/134852084/7567504.pdfIn PDF document text
    • https://lusewixitakotaz.weebly.com/uploads/1/3/4/3/134385759/b18797e1099557e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_5fa4d3f5eccb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417644/normal_5f9b013019588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384469/normal_5f92123b1b51e.pdfIn PDF document text
    • https://guzaxogovi.weebly.com/uploads/1/3/4/6/134651677/bfce8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404490/normal_5f9cac201198f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5fbc0fcf5d030.pdfIn PDF document text
    • https://lurabesuweki.weebly.com/uploads/1/3/4/5/134524451/lazuxijuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5fbb47159e30b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_5fbad485af8e4.pdfIn PDF document text
    • https://soxupewo.weebly.com/uploads/1/3/4/3/134392520/5010259.pdfIn PDF document text
    • https://jotukodapoze.weebly.com/uploads/1/3/4/6/134632246/c48fd.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/5d34985f-905c-44e4-ba36-4a829e20abc4/gitibuguvami.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_off0000b654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB654 5072 bytes
SHA-256: 4d62f0f0b041c9af1ad49e022861bba27f37bb0caddd4fca87c261152d15b181
font_01_sfnt_off0000c79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79B 11624 bytes
SHA-256: f44b5862ec61b1590a2996c71e2519546418d8007c4a356a54afa59e77bec08c

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