Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb710dd41d628c5…

MALICIOUS

PDF

72.5 KB Created: 2021-09-15 10:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0fb7fac36886bbca26962f9c8dec75d1 SHA-1: 66db447d7443482b41067e3f0fd7adf904066498 SHA-256: ffb710dd41d628c50a402b1bcc4604191a0496c104a3f6f9a3c0f7dfbe53a40c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm. The embedded URLs and the PDF structure suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content. While no scripts were explicitly extracted, the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggest malicious intent through redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=vidmate+2018+hd PDF link annotation
    • http://ed-web.cz/userfilesfile/fubijumukupajome.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/56414581523.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/poxukosutubi.pdfIn PDF document text
    • https://zzwgjx.com/d/files/76622508898.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/36754064964.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/32675480097.pdfIn PDF document text
    • http://geasit.it/userfiles/files/mefutaluv.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/komiresosa.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/94543717905.pdfIn PDF document text
    • http://skncn.com/u/files/dotaxariso.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/luxiwasoborelabati.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/lojidodevogunumor.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613280551fa71---42708638234.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-9/20210909223017387820.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/a13f0244dcd8dd0933192be97f354895/bawomovikuwojuzerix.pdfIn PDF document text
    • http://goldmustang.ru/files/files/gagowejokewo.pdfIn PDF document text
    • https://anup.bo/images/files/gowupuveduzivunelota.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/pelifarowojigi.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/5571297214.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/terodivunovavaberaru.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/winegodimusifidire.pdfIn PDF document text
    • http://kant21.com/userData/board/file/24618031502.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/valega.pdfIn PDF document text
    • https://akemi.ro/hirek/file/85059449220.pdfIn PDF document text
    • http://oreopay58.com/ckfinder/userfiles/files/motak.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_off0000bc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD430 10448 bytes
SHA-256: 97a865b2e21fb9b503df257015ff7acb9936d5b36b3b1393ab2b48396b81067f
font_02_sfnt_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 15772 bytes
SHA-256: 1590dea33c456a922df458cd94d503730219cdf4be4166c4068679b5b51035b9

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