Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8252ffd692b7874…

MALICIOUS

PDF

72.5 KB Created: 2021-07-18 03:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc25e00d1c8989021a1515ee8370aad5 SHA-1: dab8053b38b831db07dcc6504d4e07619691f2ea SHA-256: c8252ffd692b78741372c68f38d17b2aadd070813fc7770b628c42709f623754
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that was flagged by ML classifiers and ClamAV as malicious. It contains embedded URLs, one of which is a Google feedproxy URL that redirects to a PDF. The PDF structure also shows duplicate object bodies, indicating potential obfuscation. While no scripts were explicitly extracted, the presence of embedded URLs and the ML/ClamAV detections suggest it's designed to lead the user to a malicious resource, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6030

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/RVI1sXQGPkU/square?utm_term=how+to+insert+hyperlink+to+pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eddf53c450ee47307f0db0/1626201939777/58080575804.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f34e69c5d9e6782ce1677a/1626558057104/83636545745.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f349239c7c9f0ea99a1b11/1626556707596/how_to_emulate_gamecube_games_on_wii.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e920c4320dbd0de280fa02/1625891012289/drinking_games_with_a_deck_of_cards.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_off0000bc13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC13 16792 bytes
font_01_sfnt_off0000d42a.bin
78ddae6124c004d0777e7d95d05714caf8b38538fcfbe8b6d7df70c47aea7f88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 10716 bytes
font_02_sfnt_off0000ecb5.bin
0cbc23306a14a659f4d27e6a97699f5ff56b18060392fb48c8c50b4a4e96369a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 15580 bytes

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