Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a66c78deb9fce4d…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 19:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 04202e74d86867d575161bdfaa489a46 SHA-1: 4bcdea92840d7a5ace1c00512a127884d8e3045c SHA-256: 7a66c78deb9fce4da2919e3d0ce40dbe5b22b4def0d4885dba7070be5beefa12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this document being used to redirect users to malicious sites, potentially for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://contrast.no/ckfinder/userfiles/files/91995851981.pdf In PDF document text
    • http://mega-gold.com/userfiles/files/jofivolodijomuximoxana.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f315b951553d143442d499d36650518d/nanuxezokidotufinosifi.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/jisiwariwujagodegulajuze.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/wasalobawilalafitevuxofi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145c7490a3c1---5059528932.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/16795964346.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/89176537912.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/39570418254.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/97423896300.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/vovevusomuj.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/17916738931.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/94851453032.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/wabew.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/97542146878.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/40574854688.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/59659611871.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/povuj.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/73145052002.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/72384873507.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/bavigi.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/luzukerilubo.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/95878444857.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/sikikusit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sword+art+online+alicization+war+of+underworld+season+2+episode+11PDF 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_off0000aec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC9 14644 bytes
SHA-256: 5d8224f7523526b8e35d4fc2ac18f1c0ff157a30672f1331120603969697cfa0
font_01_sfnt_off0000d3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A3 11104 bytes
SHA-256: 924d2a5ba29d4c86946e1f695f87de08d0e0db7c1cbb947a27c6af7bce779b91
font_02_sfnt_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1