Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85a688a264c436c…

MALICIOUS

PDF

69.1 KB Created: 2021-01-01 11:42:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 82194b5ac963964c2d8a3ca34f111525 SHA-1: b828937bc818b36bc9a4cb9becb0033625bf6de2 SHA-256: c85a688a264c436c27d6c2d1f6aa6be757522a0faea1b24bf1e7cc02e54f8bd4
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to 'trafffi.ru', which is likely part of a phishing lure. The document body, though heavily obfuscated, suggests a pretext related to a 'World master chefs association'. No scripts were extracted, but the presence of external URIs and the malware detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/strik?utm_term=world+master+chefs+association+for+cantonese+cuisine PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408712/normal_5fe109c454896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5f8b99557b75a.pdfIn PDF document text
    • https://siwuretigi.weebly.com/uploads/1/3/4/3/134319511/a7e16080fb78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471095/normal_5fc3cf5da118b.pdfIn PDF document text
    • https://nozabuzewetuk.weebly.com/uploads/1/3/2/6/132683147/kinepowev.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/1e2414fe-57da-482a-a972-5c1b4c03d9f5/minecraft_monster_farm_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/tigonusuwezerika.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/8999039827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b414e59a-5fcf-4b97-bf17-aa1d6e949ec3/widuvavitedigekon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b25b2084-01b1-4471-80c3-c0a5282fd73a/xumovakexis.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_off0000d3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 5272 bytes
SHA-256: e295f8eae6c48d067b0ec27a3dc64423d66d7e7072ea450c8e1983b6fee30b7e
font_01_sfnt_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 10008 bytes
SHA-256: aaa2d55db56b1e4b04370eb2ec21bc6c6cd856e4675cd7abc4a3b8128483bc7a