Malicious PDF — malware analysis report

Static analysis result for SHA-256 8450a2bb7b2c454b…

MALICIOUS

PDF

79.1 KB Created: 2021-07-13 21:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 867e1a901fd6156e4229a03ea24312bb SHA-1: 76e62e86f5868421f56c5efd458a0e56bf7125a5 SHA-256: 8450a2bb7b2c454b4af58f93e7ff075f07beaacf998ad008a30f530ad4495dc8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'https://archism.ru/square?utm_term=divide+sums+for+class+1', which is likely used for phishing or to download a secondary payload. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6221

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://archism.ru/square?utm_term=divide+sums+for+class+1
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8f25704a383bbeda5500/1626115877702/tupuketiduf.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec84756ad76c0974906047/1626113141967/example_of_policy_analysis_paper.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e94884b68d8f0f4bf980b2/1625901188912/thinkin_bout_you_rod_wave.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_off0000d3bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BF 16792 bytes
font_01_sfnt_off0000ebd1.bin
fcc0649340cdd308b1bcebbec8cdb209f68894f99560b2a5c0c5ac62c1d1e3df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 17172 bytes
font_02_sfnt_off000118a7.bin
da124f45c157b9d70de3f76273f012a2715378de3f60934911000e00392a6f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118A7 10652 bytes

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