Malicious PDF — malware analysis report

Static analysis result for SHA-256 57951f09f3fd430c…

MALICIOUS

PDF

75.7 KB Created: 2021-07-16 16:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2199a88674e8e5b1e948b3784b911435 SHA-1: df80ad61120e850f398e8c619c79a4fb7198b4b3 SHA-256: 57951f09f3fd430c743a904cb22e76fcc5e33eb7bcea0cf78486b021b39ed559
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. An external URI pointing to 'crewmak.ru' was extracted, suggesting a phishing or malicious content delivery attempt. While no scripts were directly extracted, the PDF structure and the presence of external links are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7746

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://crewmak.ru/square?utm_term=april+fools+pranks+for+parents+over+text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f10fb6f9088a713e68f1ad/1626410934603/operating_costs_meaning.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60eda57b262c1d40113540d7/1626187131909/sexy_words_starting_with_k.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e79b2f7d3b385c94b223e9/1625791279338/xigetexurapamunojo.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edde7b670c344ea75d0ec9/1626201723991/how_old_are_rappers.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_off0000c609.bin
35fec7aac947444ab28f41941ba1dcebe66354207b96bc36400b135b63056af6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC609 17088 bytes
font_01_sfnt_off0000f27c.bin
21d06ba7037d8b46a003066d94c3c2a10453d7c705849d36a726ff01bcc9c0f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 10592 bytes
font_02_sfnt_off00010add.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 16792 bytes

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