Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfcab279c777306…

MALICIOUS

PDF

75.7 KB Created: 2021-07-14 01:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9c935fe974e816cee93cf7005f16e17 SHA-1: 56ba4800868787b318fed8a005fec571520c4102 SHA-256: fdfcab279c777306f31a3cbe2fa97a3ee106c1aaf8b0bbf8692d0bf0f402d798
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains heuristics indicating it attempts to bypass security software and lure the user into opening a password-protected archive. The embedded URL, while flagged as benign, contains keywords related to KMS activators, suggesting a potential lure for pirated software. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7746

Heuristics 5

  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/WVKuihPcy9U/square?utm_term=kms+activator+office+2016+download
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee0c7e8e3fff2bd3bc994d/1626213502651/pegazewasavekepezazoba.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7700db93bc0247a05ecaf/1625780237736/98466777020.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8fa4a2c5c2f6215c767fd/1625881162652/constitution_of_england.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8a6b6ad76c097490ef6e/1626114667630/short_stories_to_tell_kids.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_off0000c3b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B2 16792 bytes
font_01_sfnt_off0000dbc4.bin
6b8862784575cefa9e8e07b01a9e1fce61285610a3ec335a4551a29246fae19d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 17360 bytes
font_02_sfnt_off00010857.bin
4c3a4f81025322bf49a04aaf4e64abc73a995e5f313d903854b53091af2be0be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 11244 bytes

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