Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0232faba25c674…

MALICIOUS

PDF

76.9 KB Created: 2021-07-17 22:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf4d34531ce4989cdfa797b0108c8de5 SHA-1: f54ac53515fd5235a975aee93d0d544a168ffc74 SHA-256: 4a0232faba25c6744cbd6753e5f47b9002882640da3f8935ea91e4ac28cd11b0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains embedded URLs, one of which is presented as an HR policy manual, suggesting a phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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/ZV5PD9BTPXI/square?utm_term=hr+policy+manual+in+india
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edefb3cb43530604aa0560/1626206131721/dungeons_and_dragons_jeremy_irons.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e851afd810225d8c7cd9b1/1625837999494/ruptured_pectoral_muscle.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec841d0cf33f708d7a808e/1626113053417/how_to_combines_to_make_one.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f1b9c2c895c95c8884e349/1626454466425/percy_jackson_sea_of_monsters_free.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f2501326c2747482d56c03/1626492947248/jajonobuko.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec71ce4a8bde38c342c4d6/1626108366291/4912612312.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f2da23a047b636121eee3e/1626528291942/jujevifujidukemegi.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_off0000d3ac.bin
047cdd98c1cdd0051e9b6d8bfa3d9cde12aab41359497a3bedf1b5f70cfeda5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 14552 bytes
font_01_sfnt_off0000f7fa.bin
72c547508564c52c3e4c6f04b74f3a4bb4adf83ba721010ef304e582c634ae65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 10480 bytes
font_02_sfnt_off00010fa6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA6 16792 bytes

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