Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4301ea62973043…

MALICIOUS

PDF

82.7 KB Created: 2021-09-23 20:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 646f941c9191978821b47aa3d6b72030 SHA-1: 6e8835287f46a4ff34a4eb80446f2a98215888ff SHA-256: 6e4301ea62973043ed6cb59f295eb130735e6d31ec949eb27463b8e82185167b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'PDF_URI' heuristic indicate an attempt to direct users 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://nomylo.ru/uplcv?utm_term=my+contacts+backup+android+geri+y%C3%BCkleme PDF link annotation
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/977a87c577a1149d32e504fea1b08062/kezudomutepane.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/kakefigor.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/naluxezewuga.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/88141643048.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16131a47e6ab9f---rukigabunikusazol.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/zalawo.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/povirekilumujutena.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/bavopogalusuvala.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64175200931.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/farufonesiv.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109030657226630.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/30616189366.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/retiruz.pdfIn PDF document text
    • https://naves.cz/res/file/norimeponobipitititu.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/refatemapulusavemo.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/64030862796.pdfIn PDF document text
    • http://kodemari.info/data/files/lagobikumoxepepi.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/84320176747.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://huseyindurmuslar.com/images_upload/files/55487400327.pdfIn PDF document text
    • http://fgosvo.ru/files/files/41766329021.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210909_D8CAB23E97C0B2AD.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/84708177486.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/62468914711.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/210356043682.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_off0000da7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 17356 bytes
SHA-256: e48c92393aa20bd9741f3e2b7d2f5c9807ed5290eee0870d865def85d09f7258
font_01_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 11488 bytes
SHA-256: e3754d814764174bf10ee3b9a668fa4fa584ff5e8a841d1e4e02fec9b6598d73
font_02_sfnt_off0001225d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1