Malicious PDF — malware analysis report

Static analysis result for SHA-256 29aedaa82f003a0b…

MALICIOUS

PDF

61.1 KB Created: 2020-11-08 17:35:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bb9c6389e4018f465bdbd3e9ce00b6e2 SHA-1: b2cefecede9991e53ea9a17e59874f115121b2d9 SHA-256: 29aedaa82f003a0b672dbb731eb6003a88ec38cd9e655ccebb7f279281cc6b4c
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains like weebly.com, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. While no scripts were extracted, the structure and heuristics suggest the primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://trafffi.ru/123?keyword=forebrain+midbrain+hindbrain+parts PDF link annotation
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/6175854.pdfIn PDF document text
    • https://gulijigomun.weebly.com/uploads/1/3/4/3/134350957/c15e2ff2c3.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/2821203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_5f9f5d211fe5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_5fa3012891e9c.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/8163737.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/logajoza.pdfIn PDF document text
    • https://zuvubexusemeto.weebly.com/uploads/1/3/4/3/134373725/witaximebuxosuz.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/lukebarobeguma.pdfIn PDF document text
    • https://vujuzujotug.weebly.com/uploads/1/3/4/4/134478410/tazofedos-midoritidar-lutaxefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f875044c8b52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387218/normal_5f997980c1d58.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/e4f159b1-4854-4596-9bf8-b4ac2425c76c/suwatodarud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/954a3949-afe7-4f2d-8693-3d3e9bfccfe2/7217753135.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_off0000b320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB320 5264 bytes
SHA-256: c16e9eb8df1530c80fcbb19762d2a78b311afcbdd7eabc3f3fb1228b3f7f583e
font_01_sfnt_off0000c4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CD 10148 bytes
SHA-256: 2f2f2daa07652dad062bb2636cd5e05d2cb32c4a7b3073b8139bfcdb40a2b67f

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