Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f13c7c47b261e0…

MALICIOUS

PDF

70.2 KB Created: 2021-04-18 11:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d29107944015ab9c58b669f28150970 SHA-1: c32074484054a03afdaa210357018371d587feda SHA-256: 93f13c7c47b261e076304ac59798d501410aa473179eabf4d6c08ca86bc11ff9
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, some of which are flagged as link farms, suggesting a phishing or redirection attempt. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, indicating it was likely generated programmatically for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ambrose.edu/sites/default/files/webform/28961662769.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/66890294103.pdf
    • https://www.visitsavannah.com/sites/default/files/webform/71260674720.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/fifomibap.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/tajiwugebewozebukak.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/22559513310.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/89533113822.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/kanuvanirarotugawabu.pdf
    • https://www.woonsocketri.org/system/temporary/webform/danajon.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/sixativitav.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/ratasivovo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=boss+ve-20+vs+tc+helicon+voicelive+play
    • https://printandmail.princeton.edu/system/files/webform/54002061309.pdf
    • https://printandmail.princeton.edu/system/files/webform/ziwilijevugibapuvoboka.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_off0000d410.bin
7f3cc46cace9eae8369bc903261832c49057c4a24262ffa3e04315fc6dc9dd56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD410 5440 bytes
font_01_sfnt_off0000e6ae.bin
9a5005ea0a862ed18dfd7947555b688051c36cee9e29c0eed2c670a101690d79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 10956 bytes

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