Malicious PDF — malware analysis report

Static analysis result for SHA-256 99818b44780c5eb6…

MALICIOUS

PDF

77.9 KB Created: 2021-07-18 01:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9eb3ea5c7b84b210334ea17defbfae01 SHA-1: 34c1d2db9430a054b115f6c25d39fb6bca01a560 SHA-256: 99818b44780c5eb67321c69dd76ba85f698aadeb3b41059f63e74407294f62b6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. An external URI was found embedded within the PDF's structure, suggesting a phishing or redirection attempt. While the document body is heavily obfuscated and unreadable, the presence of the embedded URL and the malware detection strongly point towards a malicious document designed to lead users to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7390

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/iCUEKX862tE/square?utm_term=best+android+gaming+emulator+for+pc
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f342546167905317d9d11b/1626554965030/4620868112.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee7f91b1dcdf258dab8099/1626242961866/evaluate_numerical_expressions_5th_grade_answer_key.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec916011a746407a427151/1626116448836/as_of_yet_meaning.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed604193721672204a461c/1626169409710/crystal_cathedral_robert_schuller.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_off0000d07d.bin
b872e997446f7b928120a4e372e6a790b923368a5ed5ec992f876b76c22a7bbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD07D 11116 bytes
font_01_sfnt_off0000ea3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 16792 bytes
font_02_sfnt_off00010250.bin
4518c2ef918d7bf0674ae4821c332dd6e78f2c472014e81fa3273b709f1641c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 16108 bytes

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