Malicious PDF — malware analysis report

Static analysis result for SHA-256 2691b137638fede6…

MALICIOUS

PDF

67.3 KB Created: 2020-11-25 13:11:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5f40ea7f9aed4561212e2bea1cbb420f SHA-1: a5ca5ae0f35d580f0f88d1e1f3a3cab0aab640ee SHA-256: 2691b137638fede6c7761aa90f8e05ba2d35ba5644d6871b98edf8ccaa6ccbfb
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to 'trafffe.ru', which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body is heavily obfuscated, but the presence of the malicious URL and the overall detection indicate a phishing or malware distribution attempt.

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/strik?utm_term=georgia+colony+food+recipes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388424/normal_5f93fe7827b83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5f8a2fd801e60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5fae83e0266fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rujabepifar/payroll_accounting_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dacd1a86-3c97-498a-a0f0-9fb73025be7f/kozuzafubovixoxijufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c72041dc-d51e-442b-bd8c-c6c449108c1c/8924408833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5471b51-7368-45e2-89ad-9190c8223a8a/51752393703.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/timeguxonilanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edfe46af-f0df-4417-9aed-4f9db443739a/metal_slug_attack_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/337cba6d-1c99-4ed6-a614-9be52a9bfbe1/soxipidikebagot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae225d81-8ecc-4b2e-866d-c7f41b0445b2/vidox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb730e9f-e657-484c-bc65-189154e0a109/juegos_de_mesa_didacticos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE87 5164 bytes
SHA-256: b3fb7d3e23463d4591c7cce297ac97594ff1e4e60fd4016d36c440ae8e72dbc2
font_01_sfnt_off0000d029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD029 10364 bytes
SHA-256: 45361a8c9635dd882735f529672876b441bbcd8d64069b3cec7fe236ce082600
font_02_sfnt_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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