Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ed6c9b81aab4f4…

MALICIOUS

PDF

73.4 KB Created: 2021-10-04 09:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8b02f14683fe8c02713dc15f109f7263 SHA-1: 5ed7bbdfa95a27fee77cf7a6e20c9641f3fda4a9 SHA-256: 72ed6c9b81aab4f467d1b31677d86fd45e4c641d881baee0a6c5710951413d74
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=pulse+and+square+wave+generator+pdf PDF link annotation
    • http://kk-gorenjska.si/uporabnik/file/xusitosedabifijufito.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/18798414296.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/valuwilorozinonunidox.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/pomano.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441b0558b69---zozasoguxezedojuro.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/42578404668.pdfIn PDF document text
    • https://birotex.rs/images/files/sonufuserujebevikagoku.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/juriribalupavipusuxonuk.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/velusiguputosaf.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/16448287575.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/jivedezawigoruwosawejuvor.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/60847976783.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/14edff695af076e11f9328adc14dd6ef/55456053360.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/28139049191.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/joxefadare.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/wedipiwerusoxoxo.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/22400403451.pdfIn PDF document text
    • http://nprofit.hk/userfiles/19906518003.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/vuwikitividiruxalor.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/49351443803.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/ralesixupolewuzolusuxa.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/vitatajusositip.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/xegekejanotolumaliji.pdfIn PDF document text
    • http://ipceurope.be/assets/file/lubenerisiwodixegejajiwe.pdfIn PDF document text
    • http://sieuthibds.net/images/files/zeduzumaganun.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/lamatuwubatezederize.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_off0000b7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FC 18152 bytes
SHA-256: accb7e1167a7f4a23dd4668133a9cc034b2474342575049abe345843224cd9e3
font_01_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 10980 bytes
SHA-256: 14f63660ce00de9044e109eeeda0dc19d6b9af4b414860b58bf48b822b321f1b