Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fac9483b22f0c50…

MALICIOUS

PDF

67.7 KB Created: 2020-12-19 18:36:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 74c1da1ae68ac9742db8a91ab2269d38 SHA-1: 4ef4ac3ca654448e57f19a7756f3de668ca4ae62 SHA-256: 3fac9483b22f0c50538f829af351dbf257db11cb4b4aec164770d53a512ee7bc
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, identified as a link farm, with one URL pointing to 'trafffe.ru' which is suspicious. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body is heavily obfuscated and appears to be a lure for the linked content, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffe.ru/123?utm_term=destiny+2+best+pve+weapons PDF link annotation
    • https://dapobirot.weebly.com/uploads/1/3/4/8/134888013/664d8.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/nusovixowanojapov.pdfIn PDF document text
    • https://guromofir.weebly.com/uploads/1/3/4/4/134489627/fobapukenulapev_jejadi.pdfIn PDF document text
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/8664256.pdfIn PDF document text
    • https://pijafajabivigin.weebly.com/uploads/1/3/4/6/134635516/f50dedd10f.pdfIn PDF document text
    • https://wadonado.weebly.com/uploads/1/3/4/6/134677460/dagijeridoribo.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/9452e296-1e16-46bd-855e-75d16ae09617/79705596242.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/zolivavavafiremibogim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a6070f-afd6-4b96-a7d1-8c8818cacad0/84800138430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/512a0e50-2e16-4a8c-a89a-598a18eb6d3f/white_coat_investor_free_download.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_off0000cd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD02 5212 bytes
SHA-256: 2d12f6985585f5dbefd0f06bfb28c3b867e6ce6157c36f75467dbd4473c5a04a
font_01_sfnt_off0000def0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF0 10344 bytes
SHA-256: 0ef4d7e69af4a9f22f7eeee973a8ca847870b54d096200ca9edd360fa6be0f88

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