Malicious PDF — malware analysis report

Static analysis result for SHA-256 915b1d217762e7d1…

MALICIOUS

PDF

88.3 KB Created: 2021-01-06 09:11:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acecf14849aa21db310c178a3604d7c0 SHA-1: bafa05fc3cb055b0f05578343e77802049bf3c67 SHA-256: 915b1d217762e7d1b557c4ce016fd3c5ab98f7fa47c3bc2b1a7060b03b036e3c
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'trafficel.ru', which is likely part of a phishing campaign. The document body, though heavily obfuscated, suggests an attempt to disguise the malicious content as educational material, likely to trick users into visiting the external URL.

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://trafficel.ru/123?utm_term=6th+grade+math+multiple+representations+worksheet
    • https://static.s123-cdn-static.com/uploads/4389586/normal_5fdf1311d94b7.pdf
    • https://famuzupowaja.weebly.com/uploads/1/3/1/4/131406758/a60cdf.pdf
    • https://static.s123-cdn-static.com/uploads/4410448/normal_5ff16a954eff3.pdf
    • https://cdn.sqhk.co/xidujefonari/qihaeks/how_high_are_you_when_you_skydive.pdf
    • https://cdn-cms.f-static.net/uploads/4459921/normal_5fad2776dae23.pdf
    • https://cdn.sqhk.co/tegatiwuwax/iiaSnih/99424862268.pdf
    • https://cdn-cms.f-static.net/uploads/4401518/normal_5fa7ce32e4320.pdf
    • https://cdn-cms.f-static.net/uploads/4377403/normal_5f9a041a08e22.pdf
    • https://static.s123-cdn-static.com/uploads/4444374/normal_5fdf14e994830.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tobaziw/43558006483.pdf
    • https://s3.amazonaws.com/bezutu/54128929192.pdf
    • https://s3.amazonaws.com/zufaxepixiguxax/tennis_elbow_pt_exercises.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_off00011a83.bin
9f362e9dfc80339915d1dbc84243fe934b637755647a8879edca4d2d15404909		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A83 5588 bytes
font_01_sfnt_off00012d63.bin
a66f89b435e175b10152f2947ed8a856c578ee8be60c384914faa9052bd016fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D63 11176 bytes

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