Malicious PDF — malware analysis report

Static analysis result for SHA-256 a534345f323a5329…

MALICIOUS

PDF

73.6 KB Created: 2020-11-27 05:20:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7f9d04764826b35aef79b33101751e9 SHA-1: d6b7c989c7aab610e3ecf7694f2abcf49e0f6f8c SHA-256: a534345f323a5329a488916ebb3c84c3073be1f4bf195cc09ddb9dc91d49a9cc
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely for a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to 'dictionary r words'. No scripts were extracted, but the presence of an external URI and the overall malicious classification strongly indicate a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=dictionary+r+words
    • https://cdn-cms.f-static.net/uploads/4407777/normal_5fb25bba963a2.pdf
    • https://cdn-cms.f-static.net/uploads/4420608/normal_5fa85a8bac20e.pdf
    • https://cdn-cms.f-static.net/uploads/4393776/normal_5f8f6da970121.pdf
    • https://cdn-cms.f-static.net/uploads/4369640/normal_5fa73cc6cf83f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/davubewu/16501788650.pdf
    • https://s3.amazonaws.com/kovozenamofox/39052754935.pdf
    • https://s3.amazonaws.com/wilugugo/41249900102.pdf
    • https://s3.amazonaws.com/xanebavifamopez/64448721868.pdf
    • https://s3.amazonaws.com/nezanurugega/muwugefolotesovofid.pdf
    • https://s3.amazonaws.com/nakevoja/gubizufamewavubemafopixi.pdf
    • https://s3.amazonaws.com/rujimidujek/eastern_woodland_tribes_shelter.pdf
    • https://s3.amazonaws.com/nerugiraxura/4350934035.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_off0000e4bc.bin
2000b48d6cb152bb7da9ef5dc2c3285b58e2a38d41481dc649b30a474c550a4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 5092 bytes
font_01_sfnt_off0000f63a.bin
0579438edd5211b8c70cd8a631531307b47e6a3462f5473b686edfb510dfa2e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 10592 bytes

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