Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6683c99fd8c7c47…

MALICIOUS

PDF

81.2 KB Created: 2021-07-15 13:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e7efe3015dbc14cf401aa9ac00bbc6c SHA-1: e921ab452f18ddebf27c8e85905a7b3c45fde313 SHA-256: b6683c99fd8c7c47a1f838b5ff72657cba74b643c1a0c04167ac42cfa329934c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. It contains embedded URLs, one of which is flagged as a potential phishing lure. The PDF structure itself is also noted for duplicate object bodies, which can sometimes be used to obfuscate malicious content. No scripts were extracted, but the presence of embedded URLs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.1467

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/iYdez4bKglI/square?utm_term=random+misfire+after+warm+up
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7b64d8592fe3a588fda0a/1625798221542/pokemon_rpgxp_games_for_android.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee60c22af4c01978ff17a5/1626235074175/workforce_manager_interview_questions.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_off0000dde9.bin
b520987dc0def4de27792251bd386fc074b73facf49758caf4e650a02bf4ca8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 10844 bytes
font_01_sfnt_off0000f704.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 16792 bytes
font_02_sfnt_off00010f16.bin
778a4d9f52e5dce948427cbf6a4035f077d95d1edf38c5c65944b09a1163bc17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 16292 bytes

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