Malicious PDF — malware analysis report

Static analysis result for SHA-256 5958ecd598c73e53…

MALICIOUS

PDF

92.7 KB Created: 2021-07-13 19:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e73afb42cbc13d7269f1b26dc286ed3b SHA-1: a78b6c2241b7e673ef30735a4d699a2c950912ed SHA-256: 5958ecd598c73e5323b2a38d3120f27dc38cd9290a43f5150115997bdeb4411d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI that points to a URL disguised as a search result, likely intended to trick the user into visiting a malicious site. No scripts were extracted, but the overall structure and heuristic firings suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6187

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/kVSxLQpkboc/square?utm_term=how+to+find+enthalpy+of+solution
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8c99c3be7a25fda2cd257/1625868700534/24045527764.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ed9364f8b4e244e4009f5a/1626182500935/24905043952.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e900dc3b7e7c63344ed65a/1625882845067/loose_watery_stools.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_off00010558.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 16792 bytes
font_01_sfnt_off00011d6a.bin
7493614d7fe7c4c4a065dcbc3c3fa8823eb352174e62923c5fa774f77059ee62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6A 18388 bytes
font_02_sfnt_off00014e9a.bin
98bc737e080670a59d3259d920e775b7bfa289465fba6e04830614d64d0b3af2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E9A 10788 bytes

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