Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89a2379e257df1c…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 20:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b9e931655f7340588a3e80c5395bd0c SHA-1: 66c9a6973e012c50e0314eb1c022a421b6a8fa23 SHA-256: e89a2379e257df1cd7bc5ec6b5c63f9b6934c40e3180f0d3344b677656521426
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct external links, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://myucpb.net/userfiles/file/xukoferij.pdf In PDF document text
    • http://eco-building.cz/UserFiles/File/zuxoposa.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/digopozabomib.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/2047883560.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130669854a63---warulak.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/34134497413.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/vofixazasexutukidazuloni.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/61269982315.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/kageri.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/71098436954.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/77795389025.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/80284203109.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/83093632057.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/ganoburekitimelava.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/modukoxeruxisazijo.pdfIn PDF document text
    • https://ptogel2.com/contents/files/16905026515.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/rurarajefimosutit.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/5240282062.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/53895115378.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/67223054710.pdfIn PDF document text
    • http://eichler-kammerer.de/nazarimenidojunaka.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613a6ab6b8acd.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/zogapofobunaguzaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ivibrate+calm+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 16516 bytes
SHA-256: 565fd0c2da886c2f22d2b67b0afdf9e69c39708ef2b06d5a6e6f1624b91f7939
font_02_sfnt_off000113e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E5 10624 bytes
SHA-256: 7a5ab9d89f8653d62d63d853c8bfbfc570bb5e542b7a3a438248ba7940887987

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