Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a8ba5427e73988…

MALICIOUS

PDF

77.9 KB Created: 2021-07-14 06:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80b70f50d1c3fd6a74aa989e68cc74c7 SHA-1: 0250542f6d84c248f4884d7ac9decf42945b9057 SHA-256: 76a8ba5427e739889b40b4c3d30de7f9beea20ca3bad5f0704195124fd4a49fc
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV with a signature indicating it is a phishing trojan. It contains an embedded URI pointing to a suspicious URL, which is a common tactic for phishing campaigns. Although the document body is heavily obfuscated and unreadable, the presence of the PDF_URI heuristic and the ClamAV detection strongly suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.1751

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/-MXWpcYQ7kA/square?utm_term=pgt+english+previous+year+question+paper
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e86183732d3c6921e97948/1625842051895/70070982784.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_off0000cc8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8A 16792 bytes
font_01_sfnt_off0000e4a1.bin
4a115cf9c50bf7adc3448e2754eb8a29340bb06e3191ad8b3b1f8d63f31c04fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 10956 bytes
font_02_sfnt_off0000fdb6.bin
0aa56a93a866a350fa3eb1f86a87825be1ffc706fbee8214195e16389b8cd30a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 16988 bytes

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