Malicious PDF — malware analysis report

Static analysis result for SHA-256 b059c4168fe68015…

MALICIOUS

PDF

74.0 KB Created: 2021-04-02 19:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 19cc368c02931d59896a36485d65127a SHA-1: d976e1c0c41492d92bf273f0452eb8069348a027 SHA-256: b059c4168fe680153b0cbbc928aeb0135fa1dbc4202e14f4b40ac3d80d3bc524
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the presence of numerous external links suggests a multi-stage attack or a content-luring mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://botokaw.ru/award?keyword=antecedentes+procuraduria+general+de+la+naci%25C3%25B3n+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490266/normal_5fcfe61e6902b.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/direccin_universidad_nacional_de_colombia_sede_medelln.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_602298120a454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452400/normal_60530cd0acf62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488329/normal_5fdabe1b4f91d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506159/normal_600b733d8ea12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421612/normal_6027cc9816d73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484358/normal_604e358086490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_6037a7746f93d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_6013e07a1e784.pdfIn PDF document text
    • http://rezexepenoma.scienceontheweb.net/english_speaking_skills.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/donarepemi/cdc_yeast_infection_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/avast_premier_2018_crackeado.pdfIn PDF document text
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_67b20927468a4472b94c3cb25b6044dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pewibim/jalozigisexoxovaxokumaru.pdfIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_ed74d015416241cab53a2e0c5639747e.pdf?index=trueIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_840482fb56514dc18966ad95fbe6e8f2.pdf?index=trueIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_902be4bc7e334eb08ddd8e55ed1d8f62.pdf?index=trueIn 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_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 5448 bytes
SHA-256: 75082dbdb8442ee8c4834280f1c99f0e4ccadec1929997a4fbb1e158dbd90950
font_01_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 11412 bytes
SHA-256: b665390d236a9d2b2991b11bbd0af2f7875ebff82f2bf3c61874db7ebac9213d

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