Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cb64d8ab0e7703…

MALICIOUS

PDF

78.2 KB Created: 2021-01-02 03:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 17a40f6468cdf320db98814327e7a952 SHA-1: 48f909e733b84b28e4c5214bf1f874009aa71702 SHA-256: 51cb64d8ab0e7703f0474d3e6f68795c421747a2e3047dd745a9c01eb269c0b4
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL, https://traffine.ru/123?utm_term=mount+and+blade+warband+best+weapon+locations, is likely used to redirect the user to a phishing or malware distribution site. No scripts were extracted, but the PDF structure itself facilitated the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://traffine.ru/123?utm_term=mount+and+blade+warband+best+weapon+locations PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426571/normal_5f9887e4c1ecf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fe2544a6df05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5fcb1b9630110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412774/normal_5fbf7e12bd9e5.pdfIn PDF document text
    • https://cdn.sqhk.co/febenanedibu/jjjfgcc/tiruguluwusirawojifusupix.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/wulagisi/fire_burn_dem_by_flowking_stone.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/warenixugukawuxodus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d42d7cb-2990-403d-a79f-52fe7a8bf073/13744037464.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/jolusaweterubusater.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_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 5304 bytes
SHA-256: 16d07b595ede223b3d625b11bbee1b4392b19000af9b1c582f6392c84c2d8f5b
font_01_sfnt_off0001074a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 10884 bytes
SHA-256: d3bb9b425cbbd466648513176f5bd67b718211d7a9c2abc3253706b25c407542