Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e23d29fdfff4e81…

MALICIOUS

PDF

68.9 KB Created: 2021-10-03 05:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 051a6f1b45125181b2a86b99715e344c SHA-1: f0278d1d6db83bab716994b67e0ce675c06e6597 SHA-256: 6e23d29fdfff4e81096450e59333cf76253580cf69871444afdbb933f151610b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, with a significant number pointing to disposable domains, characteristic of a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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://medicabg.com/uploads/wysiwyg/files/vaxokadipukimikoban.pdf In PDF document text
    • http://jshtextile.com/UserFiles/file///xetaraliroriseligetip.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/saxete.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/84781231604.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/33779293112.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/16284989456.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/6160658503.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/figasegij.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/gezejigu.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/6085950843.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/5996943538.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/morejugu.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/94312239473.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b664c8d3b---vufipi.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210901002633-mobiputevivowekag.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/30277118458.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/82437112604.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/7336854333.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/fomapuluvegekoxow.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/lekomozupifukamin.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/7120260869.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/nofosewada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=top+right+back+pain+when+breathingPDF 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_off0000af78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF78 14972 bytes
SHA-256: bf265a789024a2f493d9d1920f825475006c3b94a8bbd3a37504cec71dc87245
font_01_sfnt_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 10720 bytes
SHA-256: 601ca6b6e06682f02ba94eeb58605fed2144369ecdc436ab601112c6f6863c21
font_02_sfnt_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1