Malicious PDF — malware analysis report

Static analysis result for SHA-256 7819ef2f6431b3f9…

MALICIOUS

PDF

82.5 KB Created: 2021-07-13 00:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d8e9c923ad7162b9fc895ada73c4105 SHA-1: c3761a4a0a80d7e4bab5bf67c979bd1e75beec18 SHA-256: 7819ef2f6431b3f9f6a68a91a6025531ed640ab28459dc2089adf5407178032b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure the user to external resources. The obfuscated document body and the nature of the PDF heuristics point towards a phishing or credential harvesting attempt, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6556

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/kVSxLQpkboc/square?utm_term=journal+article+about+education+pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ecb1879c6b0e71d6d8812e/1626124679131/college_professors_reviews.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e92f1d563c1506a8b6a472/1625894685725/33615368507.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecaea62cc4417c39d35bcd/1626123942608/when_was_the_first_machine_invented.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_off0000e0e3.bin
2fec23069dfe28460de28af809d2c657c190312f9aa7b68ee7ed93471c00c7b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 16684 bytes
font_01_sfnt_off00010c63.bin
b483e56cdda23dba59c10d87e0cf3d1dcc8fc658aec7aebf59b1dad4f07850f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C63 10676 bytes
font_02_sfnt_off000124ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124BA 16792 bytes

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