Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30ab69f0d2ea0d8…

MALICIOUS

PDF

70.8 KB Created: 2021-04-23 17:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1361c157e3cca81f4b3bea2b744cb3b SHA-1: b97b029e9ec958714b01bd34312b77baf77b714d SHA-256: f30ab69f0d2ea0d86e70896e154710a6ca2443db97f5b15d4d72d0a1896a6512
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host multiple links on disposable domains, likely to distribute malware or conduct phishing. The presence of numerous embedded URLs, many pointing to potentially suspicious domains, further supports this. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5764

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://russian-ice-spb.ru/sites/default/files/webform/files/fapulewamekunasu.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/ziwisotug.pdf
    • https://www.newburghgroup.com/sites/default/files/webform/resumes/falaburisidibiwad.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/bugoxugokerudanetisene.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/27017481005.pdf
    • https://www.mainephilanthropy.org/sites/default/files/wimatetomowitiki.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/danodajanenalidadalibebav.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/92207600326.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/35757612566.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=carry+on+luggage+with+iphone+charger
    • https://minorsoncampus.princeton.edu/system/files/webform/janoruzafasolefixos.pdf
    • https://campusrec.princeton.edu/system/files/webform/7624886728.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e425.bin
c56a76f9608274c55a147f3a7172be7fc281dbd22b42ab501853c1245b22db2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 5116 bytes
font_01_sfnt_off0000f5a6.bin
97b1041a1748c1dd61bbe9e0221755c29fe8ec94d81ced0759e889e2586e1230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 10184 bytes

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