Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3210af6a6bf383…

MALICIOUS

PDF

72.6 KB Created: 2021-09-29 02:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ce1ad7d2cda2edf855d6af809347fe2 SHA-1: a564e36b52924e48d9a8fae820735f98d4846dc1 SHA-256: 8b3210af6a6bf3836fec12c43883fd6cd6b626ff265f69c8350cb1d5a318ed89
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting a tactic to obscure malicious activity or distribute unwanted software. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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
  • 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 https://www.southdownscellars.co.uk/ckfinder/userfiles/files/22854925592.pdf In PDF document text
    • http://devveb.net/userfiles/file/61206153540.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/26173140967.pdfIn PDF document text
    • https://faceless.me/userfiles/files/85194063404.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/fopulajodukibukase.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/duc1bna4dthur5f48q4p3hai87/25447198154.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/15324360616.pdfIn PDF document text
    • http://camonetinternational.com/files/file/xotorabemalugobar.pdfIn PDF document text
    • http://greenglobepms.com/uploads/xamanutuposusibopoporiwag.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/temevutamim.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/12672830838.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131232fde396---zevibogewob.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/9838874449.pdfIn PDF document text
    • http://servmed.net/userfiles/file/totaranusilupuvipokal.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/54884587900.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/fipelo.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/xewunipekokisizikonavuj.pdfIn PDF document text
    • http://aurora-c.jp/files/files/gowuraxoxajegavogaso.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/28192431814.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/36725594578.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/6490154301.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/sadunurolumit.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/sulatavak.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/95404856278.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/25793384413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gangstar+vegas+crime+downloadPDF 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_off0000b6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B2 17920 bytes
SHA-256: 2d35e92ae94bc8ff99fa32477a36490c27baa3d5946016a8b6be99db7ebff033
font_01_sfnt_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 10904 bytes
SHA-256: c46e2eb0a01670bc4aacb7523b25849d1f12944e0910686e588e909c56f556d3
font_02_sfnt_off0000fc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1