Malicious PDF — malware analysis report

Static analysis result for SHA-256 39df5866e4b93d22…

MALICIOUS

PDF

63.5 KB Created: 2021-09-25 11:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2e21cf1433e78ffba049baf0a33c0763 SHA-1: e8ad42d31f7e0bd0eedf45e4857c82b48e09b40b SHA-256: 39df5866e4b93d22030692c5edac8fe1ae9cc5c0b980b621b88823a4b687ff6a
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. The embedded JavaScript is likely used to obfuscate the malicious redirection or exploit vulnerabilities, while the numerous external links point to a link farm strategy, potentially for phishing or distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9662

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=google+voice+caller+id+incoming PDF link annotation
    • http://colegiosantarosa.com/uploads/imagem/file/zanuzasozize.pdfIn PDF document text
    • http://220-wm01.netdbhosting.com/file/79156198502.pdfIn PDF document text
    • http://goref.ru/files/file/povikozaton.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/66624492193.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210910_081902.pdfIn PDF document text
    • https://autoskola-scp.com/files/razusisoruxawavefomin.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/jazulu.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/51659556735.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/81217326133.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/9407273441.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zobawi.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130acf82fb51---pesupetiv.pdfIn PDF document text
    • http://castel.lu/userfiles/files/33661631962.pdfIn PDF document text
    • http://napiarsaigh.com/images/67296745436.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/33237912499.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/gafotapedevefuxupajubawo.pdfIn PDF document text
    • https://onecre.com/images/content/files/nomomefafeboxesasakijaru.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/wisebegokuzitik.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/29068933128.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/razazajuzixatujawa.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613101f882bc4---17277275664.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/lavolifagazofakazajomu.pdfIn PDF document text
    • 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_off0000bcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD5 10552 bytes
SHA-256: 9e0080172ec90b440b22047fb9b3f9b0ae1e7b44621cd9bdf83d8eea96b093d6
font_01_sfnt_off0000d4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A5 18752 bytes
SHA-256: 5602039dc637338c253740bbaba695efec28233d3793a263da726bd3fe57c162

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