Malicious PDF — malware analysis report

Static analysis result for SHA-256 329051d70cd21b53…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 20:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 593fe55eb8d4b00251faaf010c272d07 SHA-1: cf42ce78e3f77deb82d32cc6f92127bc5885b866 SHA-256: 329051d70cd21b53da1b1bdc700fa64c20a061bd38340fc975dab5a42940400c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm, a common tactic for phishing or malware distribution. The presence of external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://queure.ru/uplcv?utm_term=pirates+of+the+caribbean+tides+of+war+cheat+codes PDF link annotation
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19552524976.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/gebedo.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/sazewetejuputed.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b570c8775710c0d35b4dc64aea6e5f2f/nemekikabowerikug.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/denogigok.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/72870746660.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/67450695878.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/madepebemorabususit.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/suborewajumimixijuradav.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/78610228859.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/ruxavaga.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/dafupubejazovesuwova.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/57770208738.pdfIn PDF document text
    • https://webaprint.be/img/file/vitujanuwojewujozevixu.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/34903890693.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/97915836849.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/xifexuwojowibefubesores.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7e578d58---71705045696.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/22477141094.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/kotosawodenidilogiz.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/36414173390.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/95418172271.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/63272346132.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/dosujazuvesokonivirora.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_off0000d61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE35 10752 bytes
SHA-256: a1bd7788897baf1cb68f0058f68967e8ff49294e008e4c0448305c70472cc94b
font_02_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 18136 bytes
SHA-256: 5772f52dd1dd9f7a9f41fa30bc2cfb39769377b2b641777833ee148d903a68fa