Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96a784de918e358…

MALICIOUS

PDF

75.7 KB Created: 2021-04-07 08:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be1247794f7aeeacd6a2b47e3c805d75 SHA-1: 49d569d213d104b8fe1a85956ae3c1ec1a5a7e4c SHA-256: c96a784de918e3589836bb32325a1ba1e0a3561b6ffa5a34edd4df4d6ad47737
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF with a high ML classifier score and ClamAV detection indicating maliciousness. It contains numerous embedded URLs, many of which point to unknown domains or are part of a link farm, suggesting a phishing or SEO manipulation attempt. The document body, though heavily obfuscated, contains references to 'classes of drugs pharmacology pdf' and 'wkhtmltopdf', likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/pefusoxewirevujilo.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/sinuwoxifazuroli.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/30199048500.pdf
    • http://www.friendlycc.com/sites/default/files/webform/85881129832.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/niroxopewesanusogub.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/77861868930.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/jilagofuzepev.pdf
    • https://www.visitsavannah.com/sites/default/files/webform/nodarinit.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/dakatiwilu.pdf
    • https://ambrose.edu/sites/default/files/webform/20598750849.pdf
    • https://www.termis.org/system/files/webform/nibobuzokojovafizuza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=classes+of+drugs+pharmacology+pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/45540448673.pdf
    • https://community.princeton.edu/system/files/webform/kabajizonen.pdf
    • https://printandmail.princeton.edu/system/files/webform/zupedofijemurak.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_off0000e7aa.bin
9ec181e3441596ee5035d0fa0892c1045b5c1321365963ac2d0b6e7453d17e01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AA 5576 bytes
font_01_sfnt_off0000fa7b.bin
2bd2d70ac5caf31117f4568326893445d6c78a11f643903f68863a1c2e3ab30e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 11532 bytes

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