Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f551c63ca1b1c5…

MALICIOUS

PDF

74.7 KB Created: 2021-07-18 23:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29e855afa39e1ade36a02c48decbe38f SHA-1: 89190195dabafb457dd38d79bb7469699020be50 SHA-256: a2f551c63ca1b1c52ccb3c62fbafdb023c8ceeee9fe534819d7e8475ef53c650
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 redirect the user to potentially harmful content. The PDF_URI heuristic further supports the presence of external links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7703

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/gOBB6uaVNRA/square?utm_term=group+of+birds+are+called
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee79fd84a0477e84aed6bb/1626241533748/sorry_to_disturb_you_at_this_time.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eca20f934d360eb28b378e/1626120719950/puzefimoju.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e89dd094d6cc18f19f44d0/1625857488798/papebekirevukabilage.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_off0000c585.bin
85da04d72b11382367e8e50fa621a0ca88b59a285b24fe0b2375c561f218bbb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC585 16056 bytes
font_01_sfnt_off0000eeea.bin
4a6560127990080a836806471be827a126877eccb8bc8514d18a8f865ca98e36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 10692 bytes
font_02_sfnt_off00010746.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 16792 bytes

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