Malicious PDF — malware analysis report

Static analysis result for SHA-256 33dcfe398fd6564d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 00:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 607bdd37bb87919fce30490005425ac1 SHA-1: 709e148a2a47067bfc0bc90c69b667c926195af7 SHA-256: 33dcfe398fd6564dbc47f1003bbc68f0209b84f629c859d56fb89b0273055d4c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external domains, one of which is hosted on disposable infrastructure. While no scripts were explicitly extracted, the PDF structure and its nature as a link farm suggest an intent to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://pecsimutargygaleria.hu/files/file/radeletufajigemuxisopowef.pdf In PDF document text
    • http://onlytech-tunisie.com/userfiles/file/6014892770.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/nedosimumogiguzoteb.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/fokaromupi.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/94695835358.pdfIn PDF document text
    • https://msiutilities.net/documents/sobinavimusaloluziwibir.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/sogogevaruzizi.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/1224391715.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/60100481586.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/togixodisisa.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/vupin.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/abmuat4ub1nmabrg7703pb50b3/todiwel.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/gebuzetotul.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210908085636.pdfIn PDF document text
    • https://polandpools.com/contents/files/lodasomazemozud.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/3845592689.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/movudivadibofoweputoxad.pdfIn PDF document text
    • http://gibisch.info/files/files/xemonupilenemipekilogax.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/77879831175.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/87c7a5a8acb8258cfc09232af651729d.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210909_F3F3278CEC86F48C.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161340ee88652e---84373816041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+iptv+android+tvPDF link annotation
    • 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_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 10460 bytes
SHA-256: c43270ac10001a4738b2f147b363e5894ba4410f79b98377390cb45e01898db9
font_01_sfnt_off0000fd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 18108 bytes
SHA-256: b1251890eed642fcf535a599176fa1ccbc58fa57900830b59dcdf9ce8d319d81