Malicious PDF — malware analysis report

Static analysis result for SHA-256 43136d9b7c7324b2…

MALICIOUS

PDF

65.2 KB Created: 2020-12-14 15:41:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f3bf3730556d8cc9402488557d5654d8 SHA-1: d310c28ff2147a586fa79f1c060e42fe99b6a2f6 SHA-256: 43136d9b7c7324b2464a4a3ca436809f5f00247d26d017b7570dd3a09159255c
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing campaigns. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs and a link farm heuristic further supports the phishing lure attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=american+eagles+modding PDF link annotation
    • https://tulalezosisab.weebly.com/uploads/1/3/4/6/134601470/kowokoxepu.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/15a8f9488c85.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/sejelek-neluwasekunasa-bibasix-kawupal.pdfIn PDF document text
    • https://wibagubid.weebly.com/uploads/1/3/4/3/134373733/6997503.pdfIn PDF document text
    • https://mawakigimewu.weebly.com/uploads/1/3/4/8/134875352/pewoxifuw.pdfIn PDF document text
    • https://tejivabir.weebly.com/uploads/1/3/4/7/134714352/notel.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/c95960e9970.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/rerut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384483/normal_5fc4b46d18ed3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_5fb579bbb9796.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/05e4463d-ba58-42de-8bd9-6dca828948a5/write_now_daniel_anderson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063a944e-623e-4164-9944-4d269e282f7c/work_energy_calculations_worksheet_answers.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_off0000c32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32B 5248 bytes
SHA-256: 9ea8aa2e26c011108e1de9b0c98fc7e4c496dde7b3496836e7552c174abe67cd
font_01_sfnt_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 10248 bytes
SHA-256: 5a6807fb56f39d763b8924b3b984133c3b1924277a77ccebc0b405b55325b3e8

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