Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4f813ca51b33f0…

MALICIOUS

PDF

68.9 KB Created: 2021-04-07 01:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a44281b0849471aa43cc10fb9fe1cfa SHA-1: 8cd905bbce8cf8a19f41f9bafe70cd51c89e69be SHA-256: 7d4f813ca51b33f0d620cc364c2bf8316f7b2bcf1d0086aad8c658a811adecf8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan-like behavior. The document body is heavily obfuscated, making its direct content unreadable, but the presence of embedded URLs suggests an attempt to redirect the user to malicious content. The primary attack pattern involves masquerading as a benign document to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.grotekeukens.be/sites/default/files/webform/gmawards2018/87706268510.pdf
    • https://ambrose.edu/sites/default/files/webform/zabufenopi.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/40041164747.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/95133977644.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/56601188302.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/29410319198.pdf
    • https://www.dgs-interparts.be/sites/default/files/jinez.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/89533113822.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/1289321409.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/bugoxugokerudanetisene.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/64296936159.pdf
    • http://seiary.com/sites/default/files/webform/rec/wugibizipudaxejomite.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=alphabet+letters+tracing+pdf
    • https://lib.asu.edu/system/files/webform/nexeginexepor.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/97035559296.pdf
    • https://www.vub.be/sites/vub/files/webform/86005813007.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ef.bin
cd07af259ab0e882d53686c4bb5960eb97d65cb692faf542a1442c3d5af286c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EF 5544 bytes
font_01_sfnt_off0000e3bd.bin
39079f21b8a99252f324013848b6d1b1db8cf6111b09f13ca72f14b52b35fa21
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 10532 bytes