Malicious PDF — malware analysis report

Static analysis result for SHA-256 607f30d785e42e30…

MALICIOUS

PDF

62.2 KB Created: 2021-09-22 23:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61f94bf101a2c39929143aaf0ea7eddd SHA-1: 846e0b5df9b4f042fc24091b9f9b05a6b2caf9b4 SHA-256: 607f30d785e42e307dd5cf96470c5c228a48dd45a4c124a17fcef4dea71483e7
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or content-luring scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving redirection to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9122

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://sapporopools.com/contents/files/toxapinewadigonunewuva.pdf In PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613E30AEA3456.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/xetinavosakatapak.pdfIn PDF document text
    • http://thecuriosityshot.com/16591347821.pdfIn PDF document text
    • http://packturf.fr/files/52580730205.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/9229382744.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021092013141331.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/18838633482.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/remuditasutomizop.pdfIn PDF document text
    • http://linza-market.ru/upload/files/64403115660.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/marixikazaweriwatakesatuv.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/numuzekiwetibewilipid.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/18606608521.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/5196761101.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/5071017702.pdfIn PDF document text
    • http://htygroup.com/upload/files/pawav.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613701d24bd39---70752609225.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/fekirixirokekewubex.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/safik.pdfIn PDF document text
    • https://olterus.org/contents/files/nibutuzujulivusiwifanamer.pdfIn PDF document text
    • http://gestioniarmatoriali.it/tumuter.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/65757781407.pdfIn PDF document text
    • https://coluer.ir/documents/file/dolikatagujalipofusoj.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/fubukoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=email+to+send+your+resumePDF 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_off0000d994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 10608 bytes
SHA-256: bd6d8a482b738f40dc93be1b036f4f0daea587cb934818d69f4fa31e97793986

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