Malicious PDF — malware analysis report

Static analysis result for SHA-256 b763568661bff419…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 03:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50aa2d403893b4d6a2caa49776978a33 SHA-1: 691ebe15c506ab83459f4a64e482e6f15ccc0549 SHA-256: b763568661bff41938b5b1038e2d576fa17dddd5b7d2ad7645c0c148996d6423
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URIs, many of which point to disposable hosting and are structured as link farms, indicating a strong intent to redirect users to potentially harmful sites. The presence of numerous unknown-reputation URLs suggests a broad phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://medvor.ru/uplcv?utm_term=ibis+paint+apk PDF link annotation
    • http://tataservice.it/userfiles/file/movuxagiwavazobo.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/wukoxewo.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/44152878998.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/58471093685.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/vutijinesetoboder.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/masologidudopomepefinix.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/najofefadogulenimadavasez.pdfIn PDF document text
    • http://chinalabware.net/d/files/54655016997.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/64443129523.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/16374436856142776b7362d.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161436c84a52cc---32403564875.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/zelagegujej.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/34210534455.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/27779906875.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/11601521817.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/kefunenudu.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/9088801573.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/wabekosarulovixebevuwonuf.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/40934154898.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/90958592325.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/16568971141.pdfIn PDF document text
    • https://melz-feu.ru/upload/5597282495.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/gosasonagidamum.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd62f3c178---kovidululusawop.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/32856786614.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_off0000d869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 10028 bytes
SHA-256: 5eab8a5c023b233f057e8a2c69d49c2e63d1031bb14644ff7910344847c5e5a2
font_01_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 18180 bytes
SHA-256: f78a0864af4ca2387b73464679615eb5b82f7e969c118bf0622a1620757074b7
font_02_sfnt_off00011e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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