Malicious PDF — malware analysis report

Static analysis result for SHA-256 761dcc4033eb3802…

MALICIOUS

PDF

75.0 KB Created: 2021-07-15 09:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f320747df07d1877cbd3075f63967cf SHA-1: 9cb5520d4082aaf4d3547c81c906d37aaeae9067 SHA-256: 761dcc4033eb3802e174a904e0109a69f83d59b033ab973eb72f25f662349a3a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. An external URI pointing to 'wastran.ru' was extracted, suggesting a phishing attempt to lure users to a potentially malicious site. The PDF structure also contains duplicate objects, which can sometimes be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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://wastran.ru/square?utm_term=heart+ct+scan
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edd817670c344ea75c63b5/1626200087126/81788694947.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e897f44f7f9224988fd820/1625855988941/steam_trap_selection_guide_spirax_sarco.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_off0000c766.bin
a9386897d7ac97696ddc818e0861402565bfb473fab672b538c6222f36b742fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC766 16648 bytes
font_01_sfnt_off0000f2d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 16792 bytes
font_02_sfnt_off00010ae6.bin
8fd75ce346112d2e9dbe294b325f9a72ed7f3013b7a183775be4ffe1ea1a56ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 9956 bytes

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