Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61896ce89f24859…

MALICIOUS

PDF

71.1 KB Created: 2021-07-17 00:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a87c22a52bd29c791282f1a502f91ce1 SHA-1: 96f93d2c238c4796288239911eb2445565bc7c03 SHA-256: b61896ce89f24859eb9e82662ae89a5ecd97b5755e17d70a0ceeb46891b34370
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating phishing and trojan activity. It contains an embedded URI pointing to a URL that, despite being labeled as benign, is part of a pattern often used in phishing lures. The document body is heavily obfuscated, but the presence of external URIs suggests an attempt to redirect the user to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.2209

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/gOBB6uaVNRA/square?utm_term=gnm+2nd+year+medical+surgical+question+paper+pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f133101c98e64adee8cef4/1626419984776/dupujanetonivenexarajipug.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f17f746186c4310046fa8b/1626439540649/hamiltonian_mechanics_problems_and_solutions.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_off0000b269.bin
34bd388e16b952d525ce7b4b6060150b38db2999d6e565172cfe398f5ecf3c7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB269 16632 bytes
font_01_sfnt_off0000dd92.bin
2454243ea224ae95843034f4a364d942ac54ad4fde0fa3118f51d0015dc5e84e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 11484 bytes
font_02_sfnt_off0000f84f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 16792 bytes

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