Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3b97446b35c27a…

MALICIOUS

PDF

74.5 KB Created: 2021-07-16 04:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f5395b4a44788d4a2f8d3279fe3416d SHA-1: aec0ca027e2f737c98847dd88faeaeb7b20534b9 SHA-256: 4b3b97446b35c27a2b3166c499f931ac96b309e934b6a7d7622c8bdf311dd2da
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV detection and the presence of embedded URLs strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are common vectors for such attacks. The file's metadata indicates it was generated by wkhtmltopdf, which can be abused to create malicious documents.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2593

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/RVI1sXQGPkU/square?utm_term=chemical+equation+writer+for+word
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e952b42a6f785f5835e212/1625903796829/call_out_to_meaning.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f05343f8be260d4e46716b/1626362691825/lipibogum.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_off0000bed3.bin
ee5a0d73de46bd95c87ebe61b4afde4bd9263922b54395620eba121480aca514		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBED3 17656 bytes
font_01_sfnt_off0000ed3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 16792 bytes
font_02_sfnt_off00010552.bin
6b964362f1ec38284936bc5e44b9c7c263305a135f930b18606a2e82758c277d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 10936 bytes

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