Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad56a4a9cecfb44…

MALICIOUS

PDF

78.0 KB Created: 2021-07-18 16:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a6a953b8ad7380359daf7a30c50e2c9 SHA-1: 768d455d20c4896fef4b8691c1f25d8a35ef05ec SHA-256: dad56a4a9cecfb445c8b33f6d930e0c6ca457af41fed5a68867dc7a27a545589
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with a high ML classifier score and ClamAV detection indicating malicious content. While no specific document body text or scripts were extracted, the presence of embedded URLs, including one pointing to a Google feedproxy, suggests an attempt to redirect the user to a potentially malicious site. The PDF_URI heuristic firing further supports this, indicating an external URI was found within the document structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9001

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/~3/4P1vZUbBa90/square?utm_term=children%27s+picturebooks+the+art+of+visual+storytelling+pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0272139c5d52effb83d22/1626351393795/how_to_find_frees_of_textbooks.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f14bc56186c43100449c32/1626426309259/endocrine_system_ducts.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f09278fa1341620cd94c78/1626378873028/dairy_wastewater_treatment.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee5211db6052518ec7f700/1626231313922/golak.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f240c36167905317cf98d4/1626489027586/allied_movie_watch_online_with_english_subtitles.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_off0000ccda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDA 16792 bytes
font_01_sfnt_off0000e4f1.bin
d82405808d4d38af06a9affa0357d557564f8ce1ef276a92619ac9cf48232a3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 11476 bytes
font_02_sfnt_off0000ffb0.bin
40bfb62d7ad33d5f5834e2c385e3f937c7080fd56562aa90d92f31fe86f70992		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 16884 bytes

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