Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6400b797844e29d…

MALICIOUS

PDF

66.2 KB Created: 2020-12-08 05:30:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: dbc4f2122c2dc6de9262bd8837e15377 SHA-1: 15852112587fb16a327fa36201cc3945569f38b0 SHA-256: b6400b797844e29de943a52bfb283b03275f3b86a65f2aa08ddfc8dd4b87161f
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to a suspicious domain, trafffe.ru, which is likely used to host a phishing page or a second-stage payload. The document body appears to be malformed or obfuscated, preventing a clear understanding of its content, but the presence of the malicious URI strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=robert%2527s+rules+of+order+for+small+boards+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387703/normal_5f8d9c860117d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409992/normal_5f9e11ccd7616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416654/normal_5f9bc88163517.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/4e703c8b-b9ce-4218-8aa6-c716cfc9ad66/hyderabad_house_buffalo_grove_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13bf33e1-2dfc-4529-8a4d-4113f1582d60/jigilupamotosolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a355a0ec-91d2-4b0a-b44a-22626f4e9c31/infinite_jest_reading_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/fumawanobiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8edec06e-e768-4adc-a93d-6dcfd90cb021/biomedical_scientist_salary_per_hour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe2539a7-c7f8-499e-9b2f-08181ca0fdf6/mexico_and_central_america_map_blank.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/59702044118.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/77692274699.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/55334489242.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_off0000c697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC697 5368 bytes
SHA-256: 283d8e078e9a112d1cc00629cb8412df98f3acd9db612fcfbb98320e37eb494e
font_01_sfnt_off0000d8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 10200 bytes
SHA-256: 8b5d49484c90b81ae37076fad5df8d93dee54c2b3020b924376f0802fafabba8