Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d37a80691a305f5…

MALICIOUS

PDF

73.5 KB Created: 2021-09-09 02:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 839d479a447f57b93378108e8b7e3ca1 SHA-1: 1125f8e6e1120d726c22d83743f3281ec64e7415 SHA-256: 0d37a80691a305f53067b54156ad157bb19efd5e63bb501ea78303d43674f977
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm, likely to obscure the true malicious destination. ClamAV also detected this as a 'Pdf.Phishing.Trojan'. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8282

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fiberglasssupplydepot.com/userfiles/file/96679574514.pdf In PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/74521549957.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/54323629707.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/fefifu.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/fozominupizubuxulol.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/60383135087.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/53462292256.pdfIn PDF document text
    • https://datenglagi.com/contents/files/18112858987.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/kunesozime.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/85165213520.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b7b25313e---49759510782.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/4442476026.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/xijunijuxozeneberemevidoz.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/73317733848.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/balejadafolarujuzapiguj.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/nerawof.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/vabewigubamilajipepo.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613929f19cf34---72886168496.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/kosekox.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/mumunat.pdfIn PDF document text
    • http://galedo.cz/www/data/cms_files/files/41252886491.pdfIn PDF document text
    • https://eventaipei.com/upload/files/dimofere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=son+of+sobek+pdfPDF link annotation
    • 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_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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