Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec42073a25fcebb1…

MALICIOUS

PDF

86.2 KB Created: 2021-09-13 20:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d02353ffb5e9112e64e191966975004c SHA-1: 82cc36a51e67c723dc060d36c16a4fb10438e8ce SHA-256: ec42073a25fcebb13fe6b21978feea32c0112125028dd2491ad3463bef2886cf
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to potentially malicious content, and heuristic analysis indicates it functions as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the link farm nature points to a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nomylo.ru/uplcv?utm_term=android+open+source+epub+reader PDF link annotation
    • http://sprinter-lab.ru/content/File/54193241306.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/1719179175.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/zifanol.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613746fd33ff8---10102626179.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/xatugupogixo.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/soxevuladipinajeselep.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/rusijuruwokiwolorimeliwi.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/64286119709.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/vefogirel.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/11854220977.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/26865775881.pdfIn PDF document text
    • http://keitbg.com/images/files/24113674886.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/penuvutoxexatikoraditit.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/34695868428.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/21490455416.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/mujosiwivodadedave.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/sugadopudokode.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/2927cdd2b2e659427b2ab416af03fd3b/nerabenivoviw.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/jodudojetipifakep.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/witugeladedarofesuxeka.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/80201270336.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/49937273097.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/27101998166.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/16032597225.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_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 17716 bytes
SHA-256: a1cd2bc4b2a35d89d4a40be8f4aa716237338dd54baf46162388a2b2561b1fe0
font_01_sfnt_off00011ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB3 10584 bytes
SHA-256: 8ded4a6666358186dfdb1481c2e7c5f8d6984c87aa1ae527e69cda169380eebe
font_02_sfnt_off000132c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1