Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab58a05e40857f8a…

MALICIOUS

PDF

72.0 KB Created: 2021-04-07 13:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faa5edd5baf20516f46a9a08b85939d8 SHA-1: 83b4c48914bc8bab4abe69a975d1851c63b27cd5 SHA-256: ab58a05e40857f8a69c12a6af1d588d064bed80ef0497ab5be7654a8a53d1809
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains embedded URLs, one of which points to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily garbled, contains text related to 'wkhtmltopdf' and a date, suggesting it might be a generated document used as part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/nojezajewi.pdf
    • http://spotlight-sites.com/sites/default/files/webform/4279473489.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/bugoxugokerudanetisene.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/75468476758.pdf
    • https://www.visitsavannah.com/sites/default/files/webform/nodarinit.pdf
    • http://spotlight-sites.com/sites/default/files/webform/44923699615.pdf
    • https://aboss.by/sites/default/files/webform/12132802610.pdf
    • http://seiary.com/sites/default/files/webform/rec/kutovaduro.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/jilagofuzepev.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/5308316073.pdf
    • http://www.friendlycc.com/sites/default/files/webform/topevonizudurazot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=curso+de+candomble+pdf
    • https://lib.asu.edu/system/files/webform/midari.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/kozavexol.pdf
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/ruwitik.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf7.bin
78c583760386f5eb95e1f481448f447012816c4096c84913ddd020226c9b48b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 5344 bytes
font_01_sfnt_off0000f004.bin
8bad30dd9f240c7cef7f2f5ebf41436a5873915368748b0bccef27b199ec65fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 12860 bytes

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