Malicious PDF — malware analysis report

Static analysis result for SHA-256 023898cb47293f56…

MALICIOUS

PDF

76.0 KB Created: 2021-07-13 16:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48acea85962fcf60188b1954be21bed2 SHA-1: 37dc8b6e151ed9245d0da4627dc9f51e30b25451 SHA-256: 023898cb47293f56ab9bf1abac09286dbf4150014173034968156734a76e5f1f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains an embedded external URI pointing to 'smidgel.ru'. While no scripts were explicitly extracted, the PDF structure and the presence of an external URL suggest it's designed to redirect users to a potentially harmful site, likely as part of a phishing or malware delivery campaign. The authoring application 'wkhtmltopdf' is noted, but does not directly indicate malicious intent on its own.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

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://smidgel.ru/square?utm_term=significant+figures+questions+and+answers
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7f235c244202458b0e57/1626111779191/powaxit.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e91e192dabf272355433e9/1625890329991/98666527271.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec81bffd54eb070825b009/1626112447488/lagolap.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_off0000c26d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC26D 16792 bytes
font_01_sfnt_off0000da84.bin
85bb6f222039f23f3aeb529b3a2ca8827f3ddb3b06fb9a288c1e4629ee17ef79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA84 11012 bytes
font_02_sfnt_off0000f3d1.bin
11cc11ea01dd885fa70f0808bbca9ed27d9a4223b60c19e7122368771d9476ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 17496 bytes

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