Malicious PDF — malware analysis report

Static analysis result for SHA-256 a756dd0f43d4eb99…

MALICIOUS

PDF

75.3 KB Created: 2021-07-16 00:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4be8410a43f2951b3b188bc872cca6f1 SHA-1: 742cd8fd8f0a19c7b8cffc412c01bce008010e9d SHA-256: a756dd0f43d4eb992edc1fad947a82478fb0906ffa1d3fa6a3624f152646fc24
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, despite some being marked as benign, suggests an attempt to lure the user to external resources. The PDF structure and the wkhtmltopdf authoring application are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9680

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/IdU8rIDf9lQ/square?utm_term=benefits+of+colonic+irrigation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee5627fd66ff3739f01a88/1626232359140/72369691696.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0a56e2d689d6a7ff2704f/1626383726785/text_italic_in_css.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e889a68777602c791349c3/1625852326955/watch_the_man_from_uncle_online_free.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f0a97d099c8a29993ece3c/1626384765532/79651188633.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee599bdb6052518ec85c91/1626233243157/toy_story_toons.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec9359e07849485499c4d3/1626116953968/92397625827.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8365b46a8e17713e8873b/1625831003150/10_differences_between_data_and_information.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eca4e8cd1a1204f6cb5cc9/1626121448102/early_prophase_1.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_off0000c652.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC652 16792 bytes
font_01_sfnt_off0000de69.bin
da63674383b89483cc0d0aacc5fbf5bba58d6c4e5bacd78f46c6151a9b66caf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE69 10564 bytes
font_02_sfnt_off0000f6af.bin
a10dc33fe286c132c9eba7836e43d2001010871baa1b2f8dd0e8e81df5e6a750		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 16428 bytes

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