Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ff63a405fe7dcb…

MALICIOUS

PDF

76.6 KB Created: 2021-07-19 17:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0afd16cb093ae54bd0b45588423894b SHA-1: e4e98c0d72c5eee6d6fe96be7f8cc6d1b5dd2223 SHA-256: 90ff63a405fe7dcb856d74568e9fce4064578a345864da824d988daf24294e41
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains an embedded URI pointing to a Google Feedproxy URL, which is likely a lure to a phishing or malware distribution site. Although the document body is heavily obfuscated and unreadable, the presence of the embedded URI and the ClamAV detection strongly suggest a phishing or trojan delivery attempt.

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/eoPDrVzwpx0/square?utm_term=1+2+3+english+letters
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efe928e4fb0f110d7a9794/1626335528277/93275408121.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee0719d6548a387fd74f6b/1626212121884/how_to_make_the_powerpoint_slide_vertical.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_off0000cb85.bin
93c8fb7ba6e658fef7c3f5c6b0fa4e44db59b47025fb492bd03ee1330396fb23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB85 10352 bytes
font_01_sfnt_off0000e2e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E5 16792 bytes
font_02_sfnt_off0000faf7.bin
4c23e764aac79eb8040a7a027fb1a82db3b03bba8b4d062f1872d22c2c1c6869		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 17044 bytes

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