Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc63e5662471df9e…

MALICIOUS

PDF

90.3 KB Created: 2021-07-17 16:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aee705fb390f2e373bd6127280c7bfa6 SHA-1: 7d29a3f9481a22e47375ac9a0ed43d1a4fbf808d SHA-256: fc63e5662471df9e3a1acc1d73076d824c7560033c943ebe90cd2c55764b6ab5
96 Risk Score

Malware Insights

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

The PDF was flagged by both ML classification and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a URL that, while currently marked as benign, is part of the malicious infrastructure. The PDF structure itself also shows signs of manipulation with duplicate object bodies, suggesting an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8322

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/gPkW7oTCsL0/square?utm_term=construction+management+fundamentals+2nd+edition+pdf+free+download
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee74317c5bce1f3350520f/1626240049352/god_fearing_child_meaning.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eca7459cb57f380a7b08ba/1626122053556/the_5_psychological_perspectives.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec941f9c874e7142492780/1626117151565/nubawakofeguzesimakonip.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e908f237da2614570d2398/1625884914986/dd_character_profile_creator.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f29cbc51c2e86098481a0e/1626512573008/2851355128.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f0987efab41d1faefe135e/1626380425403/9068417619.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_off0000fb6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 16792 bytes
font_01_sfnt_off00011383.bin
334cc1a5695eda86c7991cc8be69d39b47eac98377d8ad7e9219c35effb3ff55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11383 11300 bytes
font_02_sfnt_off00012e03.bin
63c81b77c7f0e56bdb476f597f6f48e58c9f5232768bc69d7f1a09e4668d5a39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E03 17684 bytes

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