Malicious PDF — malware analysis report

Static analysis result for SHA-256 033c7362154908fb…

MALICIOUS

PDF

54.0 KB Created: 2021-09-16 12:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b168369777707861f14c3b283ad91363 SHA-1: a1f50d3af89e12a26527008fce8042865f62e8b3 SHA-256: 033c7362154908fbc40e1d8fb598739350772b2915ee8ff7a4b4c85bdcd36002
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs pointing to various domains, many of which appear to be disposable or link farms. The ML classifier also flagged this PDF as malicious. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'SE_LOLBIN_RUN_COMMAND' heuristics indicates a deliberate attempt to obscure malicious activity and potentially execute commands. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8263

Heuristics 4

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://crysiq.ru/uplcv?utm_term=aplikasi+membuat+lirik+lagu+di+android PDF link annotation
    • http://muacuoi.vn/Pictures/files/jagonupeve.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/vilulovomedison.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/21252046273.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/20569001751.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/fogopigafupi.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/56514262100.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-2/20210902191723903085.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/tuvubutifafadalow.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/24281074711.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/xaxar.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/58393511814.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/70079296994.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/11516979544.pdfIn PDF document text
    • http://mosjob.ru/images/file/zalofeko.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/kilekenabisozakaximuxur.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/40136539182.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/65278471791.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141165316485---16736835625.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/nijegevukeforarozes.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/vusuzawejewomuzabaxodatul.pdfIn PDF document text
    • http://strandedtattoo.net/file/17440920452.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/71616419289.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4f55a38a1---63815964564.pdfIn PDF document text
    • http://rayocazar.com/imIn macro / runtime command snippet
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/vusutemodaxapu.pdfIn macro / runtime command snippet

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