Malicious PDF — malware analysis report

Static analysis result for SHA-256 80649421af90c1ea…

MALICIOUS

PDF

75.0 KB Created: 2021-07-15 08:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 375bf721f0d2be332fd6771f8f59f149 SHA-1: 84a3e8c24f153e94a213f549e4c71f5f062bc51e SHA-256: 80649421af90c1ea1ed1c633eb210a9a3263fb4b04b952b74f89044b0f6e1506
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as a phishing trojan, indicating malicious intent. It contains embedded URLs, one of which is associated with a phishing lure. The PDF structure also shows signs of manipulation with duplicate object bodies, suggesting an attempt to evade detection or embed malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3002

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/aauXj3bnHUA/square?utm_term=dont+hang+up+ending
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60efc8a50511021e70b33167/1626327205148/how_to_save_on_android_tablet.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec904f83836e7a7d61ce5d/1626116175719/developing_leadership_character.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_off0000c366.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC366 16792 bytes
font_01_sfnt_off0000db78.bin
ede51980f134ba0e1fe285704355eeaecafe5b6141c80081c404c31eb05b7de4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB78 17088 bytes
font_02_sfnt_off000107c4.bin
6321b4c78640856da2fc6d49ede32075c64f889b8e528d219be74fc8609b14c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 10460 bytes

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