Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56edc767d77c713…

MALICIOUS

PDF

81.1 KB Created: 2021-07-21 06:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 493100270871b051677277b4a11e67b1 SHA-1: a2aad9f5618fc58b8838aee8f644bfeeebae4271 SHA-256: d56edc767d77c71395055b70ffc315dcab4ec8e0a608cedf037d737273a52d03
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest it is designed to lure the user into clicking malicious links or downloading further payloads. The obfuscated document body further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6166

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/kVSxLQpkboc/square?utm_term=how+to+combine+pdf+files+on+macbook+pro
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f21784a9adb7280399b839/1626478468601/75614821280.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f015a4c00d13116b451d38/1626346916512/49078642492.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f364d226e2e727c262da8b/1626563794404/best_jigsaw_puzzle_app_android.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f1612078fb23041a035813/1626431776651/49527551312.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_off0000de3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3F 16792 bytes
font_01_sfnt_off0000f656.bin
2bc88f821087a4ffe02cce1c5945582f94510f6101fc12461f0b93267f71b1b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 11092 bytes
font_02_sfnt_off00010ff2.bin
2e6ab5a856fbca68f3fe0910058a3de204c8e0d222233f9793dd4d90f1892f22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF2 15816 bytes

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