Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d50c34869d56c6…

MALICIOUS

PDF

80.2 KB Created: 2021-07-14 00:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 212dbaa577f2e18193dd519910907572 SHA-1: 42fc3e7673a193a734cd7a6cc64e200b1b8bfa08 SHA-256: d7d50c34869d56c6c9d3fa9c1d0ca3b0205ca0097b8844f8d91ef0de067f6d7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document is designed to solicit sensitive recovery information or private keys from the user. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' further supports a malicious phishing intent. Although no scripts were extracted, the PDF structure and embedded URLs suggest a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier clean score 0.1467

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/razvivatel/yapz/~3/UQ8tT55rDuk/square?utm_term=wart+on+back+of+hand
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edff0f172ba47bdac7490e/1626210063740/encrypt_with_public_key_and_decrypt_with_private_key_c.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee06c01f6a9512287429f6/1626212033028/15758722900.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_off0000d86b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 16792 bytes
font_01_sfnt_off0000f07d.bin
3ebddb88d72f40b95685d9bb5e2bec7c9e6ea1bb4bec1cc53a9dcc24874d834e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 17400 bytes
font_02_sfnt_off00011e46.bin
d8709749aab5501c7b015cad0841f55d7db50eb31336975415e4df4ac5ca28e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E46 10360 bytes

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