Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fd0d99668c1e53…

MALICIOUS

PDF

69.3 KB Created: 2021-09-29 08:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d214c67b4dc4341e3ee0d62e8a329fed SHA-1: 17f39ed8de2d524bc6800f25c6e5717ac3ba57e9 SHA-256: d8fd0d99668c1e53cb2a98dd664d9301e6a5c87034fcc92264ddc7fb457a35e4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript, indicating an attempt to execute malicious code. The PDF also acts as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www-a.euro-ex.net/images/blog/file/jafelugujoxu.pdf In PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/77481506566.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/69391660351.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/22528093730.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/panedeb.pdfIn PDF document text
    • http://bibikid.ru/upload/71792916447.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/42391651920.pdfIn PDF document text
    • http://ktcz.eu/files/files/50139733913.pdfIn PDF document text
    • https://motecx.com/images/file/jowoseza.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/fukomawimuluf.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5d22c40be---figotexisox.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/zobotafebo.pdfIn PDF document text
    • http://kes.org/upload/editor/files/valewonixarafiradoze.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/26113502378.pdfIn PDF document text
    • https://sealskinz.ru/files/file/4623522977.pdfIn PDF document text
    • https://semut73.com/contents/files/19933115022.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/bejibanuzixiwu.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/63112749881.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210902174844.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/dowove.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/sifenipepi.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/16547932185.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/89318926162.pdfIn PDF document text
    • http://minhanh.com/files/38516934635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=watch+friends+season+4PDF 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_off0000afab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAB 15588 bytes
SHA-256: 65c8d57f5d0336936c6cac5dae3868f0f5fd994633b12fb96e9f1559b398c059
font_01_sfnt_off0000d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 10600 bytes
SHA-256: d67dfb3a006bef28628d4ba7508d5e5fbbb2d42d2380e8d465772afea80c70f6
font_02_sfnt_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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