Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b6a9e8d0892188…

MALICIOUS

PDF

75.5 KB Created: 2021-07-18 19:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78be21f01fcedb32231b15ae584bf3fa SHA-1: b99c8f565f89a1266ce70e3ffcdefcb16a755e16 SHA-256: 27b6a9e8d08921881e9e292e19519da25706cd78ddec6b8104aeb93f5f53b1ce
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. It contains an embedded URL that, while flagged as confirmed benign in this instance, is indicative of a phishing or malware distribution attempt. The PDF structure itself is unusual, with duplicate object bodies, suggesting potential obfuscation or malformation.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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=lol+colouring+pictures
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f23219c5d9e6782cd5c247/1626485273860/musapen.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f3b947b386920ff6d0fb6a/1626585415422/64716711513.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_off0000c89d.bin
4d66434c8252bd6240eb71f976f16e556a310463c9f11fe7bc5f5501bb858d53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC89D 16340 bytes
font_01_sfnt_off0000f2f0.bin
159cf9aaedae7c18a9803d1ca2a0c89a3f36f14c70cb0c8b0c857b484b2b4c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 10444 bytes
font_02_sfnt_off00010abb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 16792 bytes

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