Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5cd72404541ab9f…

MALICIOUS

PDF

76.8 KB Created: 2021-07-20 14:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06c15b9d89e46906acc2bd780a6295fe SHA-1: 7758521ef3411becf131803bb72aa04aa0f4a0ef SHA-256: f5cd72404541ab9f819081c4b7195dfad9e680509f057a0cc584cf624f44d4d7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to direct users to external resources. The document body is heavily obfuscated and unreadable, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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/XMoLd4EPXkg/square?utm_term=national+insurance+stamp+for+self+employed
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f34505503a216717910366/1626555653485/jee_mains_2019_all_shift_question_paper.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ecaa881996685841ac6c5d/1626122888851/wegawapovadowowog.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f5f3a2c73e1a0ca88f68f7/1626731426297/good_time_auto_sales.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f0c72e6c706f161d842e01/1626392366479/use_cheat_engine_on_android.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f04e25438249187565b2d2/1626361381141/75927930057.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f63e5f132d7d1ce061dc1d/1626750559452/7020053075.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed04cf9db072196a1d47e4/1626145999689/nunabifomugelutixal.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_off0000c8ac.bin
e91cb052b7f9e44b104f63bf0edde2ddfa80d7fa740d8c72bbe18bd7d726d14b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AC 10972 bytes
font_01_sfnt_off0000e233.bin
604a1bf93dda2f352b53bfd8f835f6303206b596de67db6d76477b6313a48677		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 17280 bytes
font_02_sfnt_off00010f0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0B 16792 bytes

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