Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d3bfa6b12b7d17…

MALICIOUS

PDF

62.0 KB Created: 2021-09-18 18:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a708a60ca7d39a55ae450d3aa03dd18 SHA-1: 955a6c28c0917c5a707724aea1c475898c4631c8 SHA-256: f9d3bfa6b12b7d173eeec52497147b6269a24e35afcf23c45121ca169ef89eba
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or phishing. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9121

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://wastran.ru/uplcv?utm_term=apk+hungry+shark+evolution+mod PDF link annotation
    • https://petrovsky14.ru/docs/files/7968465920.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/29267465114.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16141aed47ff79---pufebizuwifuwilum.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/wuruvepunukiwadumek.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/43145343677.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/251492378.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/81685895921.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/27967872376.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/jasidoravipawupoj.pdfIn PDF document text
    • http://kachelofen-prommegger.at/41896315037.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/82536926961.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/jugasesigowemifed.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/15733264226.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/51614677373.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/55595616927.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/lugopoxezebixusoj.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc1928dc1---pajat.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/vizesoruwukalupanuvofu.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/67779931383.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/61960770095.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-6/20210906041858669653.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/29844617550.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/52142999633.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9D 16472 bytes
SHA-256: 7043990b91c9607aa08bbebe3ea785877e4d95f7cda7000339021ea4fcdbd4b3

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