Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a258cfdf81a77f2…

MALICIOUS

PDF

70.0 KB Created: 2021-10-02 19:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8bf98db2e45610fca05b314ea457220b SHA-1: 253ee9779eb8029fb619a35e004a99f756fcbac8 SHA-256: 5a258cfdf81a77f25179e3664569d1df6931b73bc327fe6e581be7e1384c35e1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI redirection. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm on disposable hosting, likely to obscure the true malicious destination. The embedded JavaScript is likely responsible for initiating the redirection to one of the numerous external URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://krisoc.ru/uplcv?utm_term=united+states+of+america+clipart PDF link annotation
    • https://gruppopolidori.com/upload/image/file/81279391649.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/tejef.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/16896145983.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/wufitilefizofilek.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a41173c76d---96106654136.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/lasuvumanisoko.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109230054183229.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/40005798617.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/69110081866.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/xunezitana.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/3150801804.pdfIn PDF document text
    • http://vinmexindia.com/uploads/15146233622.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/xumafuxupemavo.pdfIn PDF document text
    • http://yibetter.com/data/files/leluwuladobitozogodewefa.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/59661920843.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/jebinavusemosanim.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/13586639482.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-06-19-18-03-44.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/zumafexiparabenosekasaw.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161583ee68e33f---29311949928.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/ruxutevasexiv.pdfIn PDF document text
    • 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_off0000ae7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC696 10788 bytes
SHA-256: e174a895b87e47a1e1a5b8dc2a9a2b640992a6470d12378d4e9bdafc867b70c3
font_02_sfnt_off0000df67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF67 16952 bytes
SHA-256: 76d2c5214db1a9ae703a5ca4ac68ca47b4f6e3a21f3205cff1962ed7f714256b

Open this report in the interactive analyzer, or submit your own file for analysis.