Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78b8624b11713d5…

MALICIOUS

PDF

72.5 KB Created: 2021-07-13 18:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec1c43d09d225bf5ac1770b46eb7f8dc SHA-1: 67b83b8b3127687bdbf0e95a468b27020064d559 SHA-256: a78b8624b11713d534b862f80eb128424b780d3ae14323246750da72594eaa51
66 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure the user to malicious content or download further payloads. The PDF structure itself contains indicators of malicious intent, as noted by the duplicate object body heuristic.

Machine Learning

  • Nyx PDF Classifier clean score 0.1902

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/y83TWYo-3DA/square?utm_term=computer+algorithms+introduction+to+design+and+analysis+sara+baase+pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e84a676b562d1627398423/1625836135402/pokijemabofutelojesuvivos.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_off0000b7f3.bin
2315b72b9a2982e14b4798a44febaa7f366273af07d091f5ccc0b1ae667ec716		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F3 16684 bytes
font_01_sfnt_off0000e366.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE366 16792 bytes
font_02_sfnt_off0000fb7d.bin
fffc763c05680464be5d74820d0cc031e2e5c9267b47a56061a1c57e369bfd33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 11452 bytes

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