Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d313f5003d2285…

MALICIOUS

PDF

77.6 KB Created: 2021-07-12 21:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8326e40277e2423d580b74f5186c675 SHA-1: 86cb947298dbc77b125548493bb517868ff70564 SHA-256: a3d313f5003d228504c9f771938b367acfda62e869a3744aa193ee58f02c0b1b
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, though marked as benign, suggests an attempt to redirect the user. The PDF structure and embedded objects are consistent with a phishing or malware delivery mechanism, likely leveraging a known exploit or social engineering to achieve its goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

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/razvivatel/yapz/~3/gOBB6uaVNRA/square?utm_term=kinetic+molecular+theory+meaning
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8e405b673687559648c3b/1625875462012/walimodotawobopifed.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8ee4e0c99b3eb2d3744d/1626115812347/a_book_on_c_download.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8b0a40121f56689ab3e5/1626114826803/protein_denaturation_is_due_to.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_off0000d15b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD15B 16792 bytes
font_01_sfnt_off0000e96d.bin
faaab73930f3ef4f583addc3ad5dfe7b02b6f5640412ac961de74dc3954cb30c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 15888 bytes
font_02_sfnt_off0001128f.bin
22d4b90c99e4c2b19b3fc1bd2e469caee5994ecb9651ce669697eccd666759cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 10712 bytes

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