Malicious PDF — malware analysis report

Static analysis result for SHA-256 8135f8bf7361bd93…

MALICIOUS

PDF

93.2 KB Created: 2020-11-19 21:31:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f31e95c9b7d943ac224a8578872fa1c7 SHA-1: d290d1ec09dad13b45cbcbe95217e10087699a60 SHA-256: 8135f8bf7361bd93136f10d32690fbb18fc35f5e960e956b7efc84de42052ac1
104 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. The presence of an external URI pointing to 'trafffe.ru' and heuristic findings related to urgency lures suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URI are strong indicators of malicious intent, likely to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=chaos+seeds+book+8+vk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401505/normal_5f9c5b491e169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f8894e10f96f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454168/normal_5fa814288fabd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460233/normal_5fa990d038b80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f95d08437377.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/zerejibixupav/are_roblox_free_models_safe.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/a_hand_to_guide_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f56718-5698-4d51-92ca-5f71b0f3991b/76360334421.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/lusaj.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/baguio_travel_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a3a64a-b736-429b-a9d1-0640aba78608/kimobenutesojedoxugeli.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/90721835807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c18f82e-578f-4453-b5ba-48211ff1e2de/pro_launcher_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lujatolu/trf_paper_avid_printable.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_off00013069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13069 5148 bytes
SHA-256: 8070a8a5c6049d6471ae7b5c54f3378ab7e19f6ca8328ca8dce86e9f65d615e2
font_01_sfnt_off000141e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E2 11376 bytes
SHA-256: cffafcf125563ff564f096439c86fb09d29d43d80c91921b5cd426fad46c3f5e

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