Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df578c61dd58150…

MALICIOUS

PDF

57.2 KB Created: 2020-11-18 13:48:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d92e403e0773bba9632daf047758e2a3 SHA-1: 1c1ebbedef2e69cbc6a4fdfe4c76dc8c959447e2 SHA-256: 8df578c61dd5815035e7ac6a20e9ae413b726a8f1b0e7430af672b0141d490b1
96 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with a high risk score. It contains an embedded external URI pointing to 'https://trafffi.ru/123?utm_term=aluminum+atv+hitch+carrier', which is a strong indicator of a phishing or malware distribution attempt. The PDF structure also shows signs of manipulation with duplicate object bodies.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://trafffi.ru/123?utm_term=aluminum+atv+hitch+carrier
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/babetafaperaxov/pebuzaz.pdf
    • https://s3.amazonaws.com/pibabopuduj/nokilaxukas.pdf
    • https://s3.amazonaws.com/rebomedug/low_back_pain_exercises_for_elderly.pdf
    • https://uploads.strikinglycdn.com/files/82bee368-9cd7-4060-ba58-8ae89a524df9/2247619662.pdf
    • https://s3.amazonaws.com/bewibiwat/wituvevakugetarite.pdf
    • https://s3.amazonaws.com/najubu/foxujubuvotafirofejax.pdf
    • https://s3.amazonaws.com/fujadabez/separable_differential_equations_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/5c1a5642-7846-4723-97d5-58fbd1bdaa09/wewibit.pdf
    • https://uploads.strikinglycdn.com/files/1b07e622-86a4-4a76-b60e-54bf87364acf/viziwipomo.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_off0000a636.bin
c77a6b023df78755b809c8b31d59cc48115f2ce85330cac6f6fb85de077799fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA636 4908 bytes
font_01_sfnt_off0000b6bf.bin
3e0237aec3333babfd025d979682e2eb1a2b53b77f59875b1928c50cff0a83fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BF 9748 bytes

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