Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1808ebc0cba672…

MALICIOUS

PDF

69.4 KB Created: 2021-01-02 09:05:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d2cbcb88d2f79941788a1551d046e95d SHA-1: 78228871118134bf60cc1ec4dce4d55b243169a7 SHA-256: 1c1808ebc0cba672a34b1a9943e2951f9ce838d3f1ed257360f20efd2a4eb009
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'trafffe.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to educational materials to mask the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=kindergarten+reading+comprehension+passages+pdf PDF link annotation
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/6207168.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/jiahjAx/miganojubololuguz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_5fe9a8117065a.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/KiaeijG/painting_ideas_for_teens.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5fc8bf8fe3b0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471475/normal_5fddbc5ba98f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_5fb2c276db650.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/852243a6-87e1-4cfb-883e-a0fc502c62a0/33594056701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed52dd9b-fc25-45f8-bfc2-dab5efb0c5b7/jirenalekitomebil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7aeb9ca-d4c6-4872-bf5d-060c0ccb9241/fodetafobumosubosafoxas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1462e661-e77e-4e68-ba75-cf8df913e5fe/62452135725.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_off0000d2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 5508 bytes
SHA-256: 95c9b3b5fb00cf66e735687b28d152a7acb9ffd913ad845b40f7179762e9d8cf
font_01_sfnt_off0000e569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE569 10372 bytes
SHA-256: 55e2f90b9890ae3e99c92a33b4c8c4be110bad6b02873750ec321d0ec6bba4d8