Malicious PDF — malware analysis report

Static analysis result for SHA-256 3830742b452d2bb9…

MALICIOUS

PDF

78.3 KB Created: 2021-03-30 20:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 94b4c45b8466d52d20cd28fc3ac7274f SHA-1: c46ec7e0ba09306489e4da380f7bf3ff596cb8f2 SHA-256: 3830742b452d2bb9156612bb25a7a5e12388b3b191c898b4bb04f242a9843c50
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing sites or download further malware. No scripts were extracted, but the heuristic findings point to a phishing lure disguised as a document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=anger+management+worksheets+free+printable PDF link annotation
    • http://bositozibab.getenjoyment.net/98604024576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481403/normal_6023e2b1b5bb2.pdfIn PDF document text
    • http://antonioit.space/28528772184sphv1.pdfIn PDF document text
    • https://cdn.sqhk.co/mekerijiwuv/gM5Jgfi/pop_shooter_blast_levels.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374521/normal_60024c86ddcfb.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/libro_de_geografa_cuarto_grado_pgina_94gx0u3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495392/normal_600a6855a680f.pdfIn PDF document text
    • http://dawezedelofeda.scienceontheweb.net/26866807459.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/87884445236.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/IWm7ejd/rosoneduzitivojavabafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489734/normal_605010447357e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_19740157c1a340fe98a96291895e7854.pdf?index=trueIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_97195add9dd24a8c93fd4a59b9c50017.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimepusox/national_dysphagia_diet_guidelines_uk.pdfIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_a2d1b7b73a9a440ca92011cd6f05a020.pdf?index=trueIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_d0acf465717c4faab810001a2ba78932.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/9140134536.pdfIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_068334af22bf4cd6920881e5029400b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesixefe/gatet.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_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 5600 bytes
SHA-256: 35d09da8192f93cdd431954d332f165740de5831ee341521abcec682214d55ca
font_01_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 11156 bytes
SHA-256: 3afbf4eb4cd73e5b4ee4425d97517886dbd0b4e3db5a0ef1b58c5f9f82cc186f

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