Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d252f777d3c022…

MALICIOUS

PDF

111.5 KB Created: 2021-01-14 03:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ea59dc9d2a1b0d61474d083a003a8375 SHA-1: 199d212beecba4289b7ac2dbdc60501ffb7e7a78 SHA-256: d2d252f777d3c0225d4e48f6336c1bb609a6c4ff3d48b658d8a824f6533d69c0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on disposable domains, suggesting a link farm or redirection scheme to potentially malicious content. The document body, though heavily obfuscated, contains references to 'War of Thrones' and wkhtmltopdf, indicating a lure to drive traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wb?keyword=war%20of%20thrones PDF link annotation
    • https://zideloxilatomi.weebly.com/uploads/1/3/5/3/135325243/2557a865168c44e.pdfIn PDF document text
    • https://dunujamovexen.weebly.com/uploads/1/3/4/3/134361976/e22bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415045/normal_5fdd00e79b6a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5fb5f99bd4d7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_5fa179ef76405.pdfIn PDF document text
    • https://nibuxapevu.weebly.com/uploads/1/3/4/6/134601724/04fd472c0e7468f.pdfIn PDF document text
    • https://siwuretigi.weebly.com/uploads/1/3/4/3/134319511/rilugik.pdfIn PDF document text
    • https://wizaxonaguwaxi.weebly.com/uploads/1/3/4/3/134306690/6804676.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/renesuwojagaseji.pdfIn PDF document text
    • https://soduwojipanaku.weebly.com/uploads/1/3/4/8/134865762/seresigovumuna.pdfIn PDF document text
    • https://bejutenexej.weebly.com/uploads/1/3/3/9/133997629/122a43e75ae8046.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fukepez/64222674558.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_off00017cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CD7 4836 bytes
SHA-256: 9abca0cf43a7a448ab14b4403dd1e969096c653aa7f593a37fe24a2f5473bf20
font_01_sfnt_off00018d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D51 10620 bytes
SHA-256: f5a0275359f8c38f94c71b9e5caf5d0faeba7f7ba860115a87291493d049365a

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