Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ac8883f816f0f0…

MALICIOUS

PDF

58.0 KB Created: 2021-10-01 08:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f780583e3ba246a234a2ab657208908f SHA-1: f429b9fb2716ab1813722e7613df1fbb8cc7816d SHA-256: a2ac8883f816f0f05d194cdac21c4c5a335db0f6772ea1d38aa1d4339c53590c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that redirect to other PDF files, suggesting a link farm designed to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's output strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5575

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 https://burstallconrad.com/editor_files/file/95856546908.pdf In PDF document text
    • http://gamecoast.by/uploads/files/suvorobinuwezamutova.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/gijogorezitupil.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/18593925070.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/jirutovafobe.pdfIn PDF document text
    • http://beta-rc.com/upload/files/5876908638.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/jomeguzokaribigi.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/zigebomaxobuviwowi.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161542c3bf0ba1---norem.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/rubewibuvuvijebume.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/timiliwujanikoger.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/33649394426.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/lefipowujamaf.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141621922557---8879355509.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/366137271.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/93432359020.pdfIn PDF document text
    • https://photojet.net/userfiles/file/66926624247.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/1181413892613bd2d69f33a.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/nitesub.pdfIn PDF document text
    • http://guowangcable.com/d/files/22006014310.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/91158561131.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20211001050832.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/92840358802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=apk+hack+editorPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 10368 bytes
SHA-256: 713bb77cd7280a82e0aac2e1a26ec9fcae9c17674b3cec6a63100aa501c4cca5

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