Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f6c7a2e7e59401…

MALICIOUS

PDF

76.3 KB Created: 2021-07-17 06:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89da6e5ecd80d95114c854eaf2dbcecf SHA-1: b8ff65f058371d4843385ce266cb289a8aff653c SHA-256: b4f6c7a2e7e5940113b61f84034da723b98591221ae7f0b527547c628644fec6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, although many are confirmed benign, suggests an attempt to lure the user to external resources. The PDF_URI heuristic firing points to an external URI, which could be part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7483

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/-MXWpcYQ7kA/square?utm_term=unpaid+salaries+journal+entry
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f23ce454c26a0cc3f0dad4/1626488036862/eso_glass_style_motif.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7e118300fd66e195bdcd/1626111505552/absorption_of_light_by_chloroplast_pigments.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edf4f1e83f616bcf85492f/1626207473793/makes_me_giddy.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f241390b1749089202fc01/1626489145390/7170265324.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_off0000c990.bin
2450ecd20db5781857755c0ec40e4732437440921e352db682576d19b55aff61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC990 16652 bytes
font_01_sfnt_off0000f4e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 16792 bytes
font_02_sfnt_off00010d00.bin
8ebdd4449c5c5d004a8e59c92150b47fd851d0c05b337f790fe864a0fe8baff7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 10736 bytes

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