Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b9d50f037cbd0f…

MALICIOUS

PDF

74.5 KB Created: 2021-07-15 20:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71d3d38074305c380b7a55203b3200b7 SHA-1: 8d87abe62a7f944335e04c595ada6867d49a4d5a SHA-256: 41b9d50f037cbd0f9f4422851ae274ce823239ec1204f597801b6b4d16eaf99b
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. The PDF contains an embedded URI pointing to a URL that, while currently marked as benign, is suspicious given the malware detection. The document body is heavily obfuscated, preventing a clear understanding of its content, but the presence of the embedded URI suggests an attempt to redirect the user to a malicious resource. No scripts were extracted, limiting further analysis of its behavior.

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/iCUEKX862tE/square?utm_term=create+arraylist+with+elements+java
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e872b35b24ce19dc58dc16/1625846451655/project_management_goal_setting.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f001851e1165054c93b3bf/1626341765603/55323989613.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_off0000c254.bin
355a155789c6406fa21b4b9bf456ebbd48fc9b2a6087d4dcde32c0fbe9e6ff60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC254 10680 bytes
font_01_sfnt_off0000daa1.bin
2c5f905183dd103ffb0245e35024832177a4d47dda097b6f52386dc7b7a32549		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 16780 bytes
font_02_sfnt_off00010687.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 16792 bytes

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