Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2251369bdc03ea6…

MALICIOUS

PDF

77.6 KB Created: 2021-07-17 04:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84816df4ce4806f771d2071967f53c87 SHA-1: 8c364ef079d768359fcfa9d1f9c82f59a219e75c SHA-256: c2251369bdc03ea6f5b51c45e744bb3ac415fb52b4eee89e4b2910a2caffcf74
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as 'Pdf.Phishing.Trojan-d2568dad23a94d95', strongly suggesting a phishing or trojanized PDF. The presence of embedded objects and external URIs, even if currently benign, indicates a potential for malicious content delivery. The wkhtmltopdf authoring application might be a clue to how the PDF was generated, possibly as part of a larger attack chain.

Machine Learning

  • Nyx PDF Classifier clean score 0.2210

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://feedproxy.google.com/~r/sq/ugae/~3/y83TWYo-3DA/square?utm_term=levels+of+the+game+pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f2231622c2eb2072114200/1626481430986/2_laws_of_refraction_of_light.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7695926d1b15707cec782/1625778521396/12785465668.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_off0000d0af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AF 16792 bytes
font_01_sfnt_off0000e8c1.bin
e02377db7065fa77a8f53d4302e32a1402e27fbb6c779b8e95964648b537d5f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 16096 bytes
font_02_sfnt_off000112a1.bin
e16e6ee17eeec7094280f14490929ddf1f50156f350dcfa2bdc7d88623494645		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112A1 10672 bytes

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