Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8806556c33a937…

MALICIOUS

PDF

93.0 KB Created: 2021-07-19 07:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ba852389dd9b7c85cefe49bd50b7912 SHA-1: c337eafba0007b4e2d208e91e560e6df57c4daa9 SHA-256: bb8806556c33a9371f7c0339d7a31087d2ed9fc4de72aa3c812d5510d72a9e9e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of embedded URLs, despite some being marked as benign, suggests a phishing or malicious content delivery attempt. The ML classifier also indicated a high probability of maliciousness. While no scripts were explicitly extracted, the nature of the detection and embedded URLs points towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5781

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/sq/ugae/~3/eaN1Eb74jJI/square?utm_term=adco+process+of+composting
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee403b8685745b7d1528e0/1626226747863/how_to_pronounce_about.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e9331b8ce0e10532d343fa/1625895707711/botany_questions_and_answers_download.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e910a2c0906550d90a960d/1625886883114/sajafalatesabed.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0b75bfcdff1298e4f098e/1626388315418/fun_quiz_games_with_answers.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_off00010de4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE4 16792 bytes
font_01_sfnt_off000125f6.bin
67c62e25356097dd33215b089bd5b915ec0506381f106906411689593efda578		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125F6 16224 bytes
font_02_sfnt_off00014fed.bin
a50eb8d4405091c01dec74ecd659f89fc73177a4ddad4df0216ad3d13815ddd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FED 10736 bytes

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