Malicious PDF — malware analysis report

Static analysis result for SHA-256 c249206130f7e94f…

MALICIOUS

PDF

65.2 KB Created: 2020-12-21 08:37:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9351bb6ed989036f18b1a2bd0e537cf6 SHA-1: 854374e1b1b335567ab884a6f823b5b6d7dc3eeb SHA-256: c249206130f7e94f1397c6956418912d150617895aae4e1be52e1a35ec75081e
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one prominent link pointing to 'trafffe.ru', suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_LINK_FARM' further supports the conclusion that this document is designed to redirect users to potentially harmful content.

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 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://trafffe.ru/aws?utm_term=chap%25C3%25A9u+formatura+molde PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382976/normal_5fa486e99b7b1.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/kasibe-mibotuwesetoz.pdfIn PDF document text
    • https://dufanidozit.weebly.com/uploads/1/3/4/7/134764520/fosaronozirixo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404987/normal_5fab6c1eeb464.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/621f70ebfb1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f9244443baac.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/843a8b6a-3cfe-4373-8781-7824d0ff0036/wosemilugonekaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c46064-5b67-4a4f-84a5-a22f7b7d7562/guwelefipunekokozapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff50d93c-2fdb-4bee-8821-c77bdd47ba72/zibarabadesakumupowanilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf7dfc5d-ce6a-4128-be54-2636deaea4e7/belufiwarixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d181de0-021a-42ae-a86e-c47a4485bb9c/govegowiduzumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c573bac9-d442-4150-804c-fcfaa802e487/financial_accounting_8th_edition_kimmel_answer_key.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_off0000be24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE24 5152 bytes
SHA-256: 6b5a0448cb29d4db8416d5fccbfa8f2e13ce5473a7d712f0870e3f9aea158994
font_01_sfnt_off0000cf35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF35 12900 bytes
SHA-256: 4449d658e94e09bb6dff8ab975463cd9595e4f10f4b81e8d5683796e33aad024

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