Malicious PDF — malware analysis report

Static analysis result for SHA-256 85dd93d804ecdd7e…

MALICIOUS

PDF

63.4 KB Created: 2020-11-18 12:53:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 66e288abd97ee61d4a87afdecc18b1ab SHA-1: 103d64b54d011fba217edf178148561c2801e9d4 SHA-256: 85dd93d804ecdd7ef2c647932a721696303f26593b141ef30e937a4b8b423af2
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a critical detection score. It contains an embedded URI pointing to 'trafffe.ru', which is a strong indicator of a phishing or malware distribution attempt. The PDF structure and embedded content, though heavily obfuscated, suggest an attempt to exploit user interaction via the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/strik?utm_term=readers+theater+rubrics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f875acf6efb1.pdfIn PDF document text
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/nalafezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426088/normal_5f9fa10622a11.pdfIn PDF document text
    • https://tuxilumamiwuwuw.weebly.com/uploads/1/3/4/5/134582020/df17619f6e.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/856b58e53af63.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/wopoxolagibuz_lupurovegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405922/normal_5f971390c3086.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bezorito/sandwich_coloring_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/147dde3d-41c8-4ba0-92c8-bf5e45f34836/zitefunimibamot.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/94083306021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98313175-514b-4168-a729-d82da560c75b/dofatulizafeput.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/612f9058-a9a3-4765-91b9-e120d0de619f/57727921979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4305f7c-f71b-4877-8fdf-386bcbbe5ab7/94687833222.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/3204915978.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/46268812500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/571b1c11-817b-4428-a185-11db63ba8287/1731993074.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_off0000be92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE92 5140 bytes
SHA-256: f84719b983f00c1bb95d14a62acc86ce5e815698979e6238d46932575cd0cf27
font_01_sfnt_off0000d006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD006 9696 bytes
SHA-256: 4ab0cf56bf69c0e3ebfbdb4cf0c65332cebdc793d216910ff4985b0234c9f0ab

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