Malicious PDF — malware analysis report

Static analysis result for SHA-256 8228c9e01abc1d1b…

MALICIOUS

PDF

79.6 KB Created: 2021-07-17 19:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e5e6117297ece9b3c7b018c4a6d4996 SHA-1: 47ca6b13d53d492c0b0d6634d8a487bfd49e5bd6 SHA-256: 8228c9e01abc1d1b64b53057116361a87ae592a5cd90623c3027b8e878aecf0a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains an embedded URL that, while currently flagged as benign, is indicative of a phishing or redirection attempt. The PDF structure itself is malformed, with duplicate object bodies, suggesting an attempt to evade detection or obfuscate malicious content. No scripts were extracted, but the overall pattern points to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8187

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/~3/1LSSs5qy-i4/square?utm_term=how+to+fix+the+right+joystick+on+an+xbox+one+controller
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f17c53adf71e7547d0959a/1626438739366/jinofelazavu.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f1924a20451d3d14e883c2/1626444363026/height_increase_loa_success_stories.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60eff658e4fb0f110d7b2a9b/1626338904525/dipuwiwazepog.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8e4aef492d21a0f67da27/1625875630258/a_chinese_ghost_story_ii.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f2da7b7e0b4d5f6b14e4d8/1626528379287/to_be_devils_advocate.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f0c0081d6532080095fbf5/1626390536339/if_lines_are_parallel_then_alternate_interior_angles_are.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_off0000d413.bin
54413cd2a8a9b3d081a70f73150dcd816f154bead97a6db898120bc01f9e1553		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD413 16008 bytes
font_01_sfnt_off0000fd70.bin
56b52096b4335e6d62e4748d6a3e4ee2ab391b4756a88d621fc3bd44c1bbb559		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 11272 bytes
font_02_sfnt_off000117e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117E6 16792 bytes

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