Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c6486fb5ba506a…

MALICIOUS

PDF

71.6 KB Created: 2021-09-30 14:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a656824211f9fd0a7806a86d76e80b4b SHA-1: 03f24540d0e21efc432eb376001d102390a9ffeb SHA-256: b5c6486fb5ba506af30a0800020f5f26f07d732aa1e3501643fa59fc399654e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to sites hosting malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attack pattern designed to exploit user interaction with embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://qazaqbanki.kz/data/content/files/3821522190.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c9407e182ea512720c2833d0fc45344a/jesoxodajofunuj.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/37699991252.pdfIn PDF document text
    • http://mimpishiosatu.com/contents/files/gixomizovujave.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/sazoraliragoleperulu.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/6749852619.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/rumepufoxutelejagi.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/mikujivozinipoditamo.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/makov.pdfIn PDF document text
    • http://rts-3.ru/upload/files/lodisugure.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/xedajaru.pdfIn PDF document text
    • http://cascad-trans.ru/files/80746549767.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/21843161022.pdfIn PDF document text
    • https://firsathosting.com/calisma2/files/uploads/risakekenivabupejepojen.pdfIn PDF document text
    • https://lapakunited.com/contents/files/27239378096.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfed51ac74---momaworapiwiferavugufu.pdfIn PDF document text
    • http://cnfgl.netsociality.com/upload/files/doxewuvotumakasegoji.pdfIn PDF document text
    • http://centronegozi.com/public/73649991419.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/nufulavu.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/guwigonidosigajof.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/34224581809.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/28302914139.pdfIn PDF document text
    • http://email-database.info/userfiles/file/29793665057.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/tipebilivapina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=hill+climb+racing+in+pc+downloadPDF 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_off0000b44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44C 17284 bytes
SHA-256: 8a06932e0cb4098126476ecf433c4f19b3a72671d62a7af0a28d2ea8b99d77f0
font_01_sfnt_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 10676 bytes
SHA-256: f34a6f78859fa2c4f65c818e890ae23ad6e077136e105679dd537f7ed2d26d7b
font_02_sfnt_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1