Malicious PDF — malware analysis report

Static analysis result for SHA-256 5985c24f4f2e2703…

MALICIOUS

PDF

88.5 KB Created: 2021-04-01 18:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4468e873d44ed49718901e0c8d2e1ad6 SHA-1: d2055569bef817e192308867860a0f585255b89c SHA-256: 5985c24f4f2e2703848749636022b603d569da1c6cce5e196af6db77f41ef611
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/award?keyword=edema+cardiovascular+pdf PDF link annotation
    • http://biwedujurar.mywebcommunity.org/74732617113.pdfIn PDF document text
    • http://robudodupuwa.iblogger.org/saxonejatuxajukix.pdfIn PDF document text
    • http://kovativegapok.getenjoyment.net/verbal_reasoning_practice_test_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406777/normal_5ffd61a3bd330.pdfIn PDF document text
    • http://pexukakadom.22web.org/74100836366.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420245/normal_600559083539f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_601252c54642b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_6050ebae6c430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5fdac6171469b.pdfIn PDF document text
    • http://bodibuburotegi.22web.org/51296510676.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_7bd2a4217a3c41128a3c07e598f3fae1.pdf?index=trueIn PDF document text
    • http://kiwozoma.epizy.com/dead_island_2011.pdfIn PDF document text
    • http://kutezowifemiwe.epizy.com/cd_rom_burning_software_free.pdfIn PDF document text
    • http://zumoriko.epizy.com/honda_lawn_mower_parts_online_uk.pdfIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_565ed93a25454462b99da9409248b1e2.pdf?index=trueIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_aaf298da8e9e4277a24f1ef2beade865.pdf?index=trueIn PDF document text
    • http://nojubeweba.epizy.com/biomedical_instrumentation_lab_manual.pdfIn PDF document text
    • http://guwaxilajoxeza.onlinewebshop.net/9378270997.pdfIn PDF document text
    • http://poxemibusap.epizy.com/xabamuzozuraja.pdfIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_9fb55ffcd4d64c28a59be7c11cb6cf68.pdf?index=trueIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_9d286d857d6d48639be652f2df428e8c.pdf?index=trueIn PDF document text
    • http://nikirijokagaza.epizy.com/augusto_comte_livros.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 5012 bytes
SHA-256: 4b38e77768d8b7270a55bcb5679e5ad6c6af06aac639a7592cb8afca08006dd1
font_01_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 12608 bytes
SHA-256: e6ba75cb6f6de5bc876dbbb175e1546f4d5a6f318bf4cd64118bbfd6af65e958
font_02_sfnt_off00014698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14698 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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