Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91191248cac00d3…

MALICIOUS

PDF

75.7 KB Created: 2021-07-16 19:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8e46bda3c57fe116456c4e27f968d2d SHA-1: 7801c9d8469b2549218e401986d64ab27d751a85 SHA-256: b91191248cac00d335b18a7221480c79b2390aa11bba6141cb6c6c7a193a2a06
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure the user to external resources. The PDF structure and the nature of the heuristics point towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7746

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/hIkXU_AiHkM/square?utm_term=up+assistant+previous+question+papers+pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee6fa7aa539923b58984a4/1626238887702/65076092979.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f057893159f50439c74a6e/1626363785966/jutazosaz.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ede153e83f616bcf831809/1626202451144/shapes_with_reflection_symmetry.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e79979efb14d11220d6cf0/1625790841603/bumupuwevo.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_off0000c5d0.bin
d3e6ea8b788006464877d530beadb628ad1b43302f856a35e54bc5a6b8231e44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D0 16864 bytes
font_01_sfnt_off0000f1e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 16792 bytes
font_02_sfnt_off000109f7.bin
00c33dddbd7b606ea8f1ebb5df4637a84a3a35973a533da5a5e6c68ecdd54b42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 10764 bytes

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