Malicious PDF — malware analysis report

Static analysis result for SHA-256 185ceb0facc43b21…

MALICIOUS

PDF

102.4 KB Created: 2020-11-21 00:57:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6e30e21e8569f842debe5573354175a4 SHA-1: 21b3102a7732e502285bd4933deee12079b833b1 SHA-256: 185ceb0facc43b21029c0582bc353cbc630fed870713440d008e9dee218c5db6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to PDF files, suggesting a link farm or a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the PDF structure are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffnew.ru/wb?keyword=chromaticity%20diagram%20template%20origin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477408/normal_5fb7241077a5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f87e7a116eae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5f897d979f0ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5f9157374885c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_5fa84e89560a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_5f9a131b025df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_5f8f61b8a2e22.pdfIn PDF document text
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/c2064a2c282d8b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370543/normal_5f88c0e76de3a.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/2387b905-93c4-4945-b42b-c101bc8eec42/mofelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b730b634-e0fe-48d5-9587-2dfc8a3fa363/67586890307.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13080 5316 bytes
SHA-256: 463924657d8b1167f329c178994ac92fb2ac1d9621161b00369567f6d318f204
font_01_sfnt_off0001426b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426B 15632 bytes
SHA-256: 9b795b8d4e7c6a3ae95044d1b68f3321084f3519644d0ee3d332cdfffdfba036
font_02_sfnt_off00017781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17781 16232 bytes
SHA-256: c01695cb9d35341aa6bd5fa703e5570e89bdc30ada151fd0703e116a085a8c34

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