Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1b401df5e13aea…

MALICIOUS

PDF

89.9 KB Created: 2020-12-23 07:43:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c89f12243bee64b932e2b23cc22f7ad SHA-1: 1558ff5672097350dd10ebb59c3d773dc34d01f4 SHA-256: 0c1b401df5e13aea9127abb24011052454236263f56bd765b9da5d56523a09dc
96 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a ClamAV detection and an ML classifier. It contains an embedded URI pointing to a suspicious domain, trafffe.ru, which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=ncert+solutions+class+9+science+chapter+2+studyrankers
    • https://cdn-cms.f-static.net/uploads/4451363/normal_5fd1026f800eb.pdf
    • https://cdn-cms.f-static.net/uploads/4410975/normal_5f9a829644a10.pdf
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5f8fbf239c792.pdf
    • https://cdn-cms.f-static.net/uploads/4408009/normal_5f98c03d6b5f9.pdf
    • https://cdn-cms.f-static.net/uploads/4381973/normal_5fbb30db858dc.pdf
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5f89f0ea25d9d.pdf
    • https://static.s123-cdn-static.com/uploads/4472185/normal_5fcbc2d45cc24.pdf
    • https://cdn-cms.f-static.net/uploads/4374708/normal_5f93821b018a3.pdf
    • https://cdn-cms.f-static.net/uploads/4367013/normal_5fa8ac41bb210.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fdd37863f59a2572d8ffde5/t/5fde5433ef8e407a9e8d88a3/1608406068116/fawapukuwonetunedi.pdf
    • https://static1.squarespace.com/static/5fc29dd524b06a7eb30a4ada/t/5fcf8f7f14319a51dc366507/1607438207383/61083895705.pdf
    • https://s3.amazonaws.com/sizadagazagaj/assignment_of_benefits_form_homeowners_insurance.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122f8.bin
2b58bbcd88855b1a06767f60fdb759aa07e6ae304060c94bdf7615fcba18a8a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 5584 bytes
font_01_sfnt_off000135fa.bin
a0261cb0823943045572f03dc33168e75265b69ce5bbe94db059540c66597aec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135FA 10660 bytes

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