Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa25e9bc5465edc…

MALICIOUS

PDF

73.5 KB Created: 2021-07-14 00:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42cf15bf855f0c0d85f741f5645f42f8 SHA-1: d928d0cc901ad7ef0cb9b3906938801dff7e0bd1 SHA-256: 9aa25e9bc5465edcf7719c053b91e02a32dd7e1832f0852a424cfa10f976eff6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with a high-confidence heuristic identifying an external URI. The embedded URL, 'https://cructi.ru/square?utm_term=part+and+whole+question+answer', is the primary indicator of malicious intent, suggesting a phishing or malware delivery attempt. No scripts were extracted, but the PDF structure itself facilitated the embedding of this malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7218

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/square?utm_term=part+and+whole+question+answer
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7b8bf89f8e700bf69960/1626110859843/namatipopexezobimizor.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edff5dcc8e436e4668db77/1626210141380/all_johto_gym_leaders.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edb5bec48108232e475550/1626191294681/not_real_socialism.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7b6b950202184f0fa91e/1626110828008/the_law_on_negotiable_instruments.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bca8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA8 16792 bytes
font_01_sfnt_off0000d4bf.bin
e074a769283b5fbc2f43c9ddfc2a0756378ff32d1c8e7c9c1e92647a8cf110d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BF 10676 bytes
font_02_sfnt_off0000ecf9.bin
485bf1932a46a652bbdcfc8220b2d6fe26f63442498beae05c581761afb12e7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 17232 bytes

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