Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb531d3a3c9814d1…

MALICIOUS

PDF

82.1 KB Created: 2021-09-10 02:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df6f26962d17936854cf6efb57d57aa5 SHA-1: 8798786a44dc17cf5ce6d68a897bb02b658145a3 SHA-256: eb531d3a3c9814d171db202c33467066e4352408176aed335fdeabd835d17998
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to disposable hosting, suggesting it functions as a lure for phishing or to download further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the assessment that this PDF is part of a link farm designed to distribute malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=how+to+install+os+on+android+tv+box PDF link annotation
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0a7c1212500222f1761f93220b8ffb5a/70033904106.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/tasebe.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109070136122609.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/37709643144.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/sinam.pdfIn PDF document text
    • http://cga82.com/admin/File/lajizuvelom.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/32060574049.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/pexugijezozovegitotu.pdfIn PDF document text
    • https://rinducm1.com/contents/files/26236746384.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/kamiwet.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/75585940230.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/84325916226.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/33330590633.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/32370040845.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/mutiputederonaze.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/poxijigurufexigasubuxago.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/rekanesu.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/gomikipiva.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/723466dc40dca8d73f5c99cc05d1c897/24383901698.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/62528051716.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/81267982762.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/tababoxeliner.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/zulediviwux.pdfIn PDF document text
    • http://alltechsro.cz/files/lapemoxawasorakowudujew.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/78613772677.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_off0000dcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD6 17724 bytes
SHA-256: fd8183aa22c6618874a6e5006aa0889f7639f0e2a9f6cac45e138b0db3331211
font_01_sfnt_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001229e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229E 10496 bytes
SHA-256: 9f46c24d9ed0623c1b553c018eb926bd3a4bb5e9c0cdd1a365db392233a24511