Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf55c23a68b1d1a…

MALICIOUS

PDF

70.5 KB Created: 2020-11-13 16:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f09c9b73ce78429fa46909f953ce3e0f SHA-1: d75162b9e5aaf3f5ceb86de2fdd672c2e4f6d3e0 SHA-256: 4cf55c23a68b1d1a3f9e1f5e14c5eeebb6147b7727efd7aa480254e8d8db6e6f
96 Risk Score

Malware Insights

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

The PDF document contains an embedded URL that points to a suspicious domain, trafftec.ru, which is likely used to host malicious content or phishing pages. The document body, though heavily obfuscated, suggests a lure related to 'free country ringtones to download'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://trafftec.ru/123?utm_term=free+country+ringtones+to+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410459/normal_5f95204c3adcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393044/normal_5fa8ad0276832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387586/normal_5fa27c8a4a14a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f8c2332c5588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450639/normal_5fa94e4bea24f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385413/normal_5f8e5b17c36ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453329/normal_5fa6f6778638b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f9991565e7d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f8ce7ee4852b.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/300381d7-db6d-4ccd-90a4-a91d944a7f4e/36188485322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d65f66ca-65a2-4dfa-aa81-397abf1d0739/wezitazimuluja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/772c0d3b-1190-411b-bf0a-111668f7a7f8/name_four_natural_resources_found_in_michigan.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/western_albemarle_high_school_crozet_va.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/92650065738.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_off0000d870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 5256 bytes
SHA-256: b92751ac6ff81a52bd8953f0b8a0dae1c1106d2b686072a2f2090bddb6c1ded7
font_01_sfnt_off0000ea84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 10136 bytes
SHA-256: 343a9af4e730ee930cb22b686578e4a4684b2ac972c23b1540819fc24c3bb2ef