Malicious PDF — malware analysis report

Static analysis result for SHA-256 08686e276eee4e66…

MALICIOUS

PDF

56.1 KB Created: 2021-04-24 08:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86601b46e78d43958f38d0e8d5af0c53 SHA-1: 55e7813b517b328dce9f43001ee219239e8dce84 SHA-256: 08686e276eee4e669dd5c01f2dbbeff6e4c2a1d95458fe0726cbd7e3a25b2490
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and configured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, not a typical user document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8741

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
  • 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
  • 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://cicatsalud.com/html/sites/default/files/webform/53132673180.pdf
    • https://web.liderpapel.com/sites/default/files/webform/xikamiwaboloz.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/34869944823.pdf
    • https://web.liderpapel.com/sites/default/files/webform/wavunivuzabanovomid.pdf
    • http://portal-mysigma.com/system/files/student-proof/62332338419.pdf
    • https://www.telluridescience.org/sites/default/files/tstc-applications/nuwirofu.pdf
    • https://www.newburghgroup.com/sites/default/files/webform/resumes/falaburisidibiwad.pdf
    • https://www.jsif.org/sites/default/files/webform/rijuluzevowogadabiwi.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/zatepatepekaberemosigedix.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/72664382884.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/3018222411.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=white+tiger+netflix+age+rating
    • https://thesanfordschool.asu.edu/sites/default/files/webform/87767597376.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0cc.bin
93591e13a331b451e3b4f2965780a9522b65694f9459bc6057dcb0d58f43da80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CC 4932 bytes

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