Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ac0b6ba88ad9eb…

MALICIOUS

PDF

75.3 KB Created: 2021-07-13 20:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe866ae6fe25259133da520ddf3f2011 SHA-1: a12c14ce4814fb51878e662fec3620883635aa32 SHA-256: c0ac0b6ba88ad9eba1f8c22cdecea1f5f1fb1db5d017767f8a07540dcd1553a7
66 Risk Score

Malware Insights

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

The file was detected by ClamAV as 'Pdf.Phishing.Trojan-d2568dad23a94d95'. It contains multiple embedded URLs, some of which are marked as confirmed benign, but the presence of a trojan detection suggests malicious intent. The PDF structure also shows duplicate object bodies, which can be used to hide malicious content. No scripts were extracted, but the ClamAV signature indicates a phishing trojan, likely delivered via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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/iXsW93xxTQA/square?utm_term=history+notes+pdf+for+upsc
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8666f7b2085302d8ff648/1625843311183/unified_soil_classification_chart.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec76fbb6dedd3ae1678244/1626109691664/automatic_and_manual_cars_with_both_transmissions.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_off0000c516.bin
9d8f2f38311bcd83ec0735f2aa5da622b31e6487518f381ec40f638f50f481ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC516 16968 bytes
font_01_sfnt_off0000f109.bin
ff919fcfd00c9b1a705d9a1cde6f80dbacb246f942cf2b5a838bb5f1d0bc75dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 10612 bytes
font_02_sfnt_off00010974.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10974 16792 bytes

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