Malicious PDF — malware analysis report

Static analysis result for SHA-256 1459f0dc7b87b306…

MALICIOUS

PDF

70.7 KB Created: 2021-09-19 10:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: baabe2b491891a522753af00309b2285 SHA-1: 868041679e6be1576c4dfb450108b4d180b3f4f8 SHA-256: 1459f0dc7b87b306f8a9da5d5bfe50f3eddf4dc2ff86b79a86cf99dbb88bb129
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://zoltysnieg.pl/pliki_wyswig/files/nebenilijosegasofuget.pdf In PDF document text
    • http://duhochoangthanh.com/upload/files/33985011456.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/40298124084.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/kesubafujulajewafane.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/fefeba.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/zavaluraxorumavevomo.pdfIn PDF document text
    • http://twilaw.com/files/files/gumarabalomodoxolorutat.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/wujenekifujikujoxexe.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/2774231828.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/viwanusot.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77339955389.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/xogojanetoluxojono.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/49806111737.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140499d2ba97---32446298284.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/gobanejibinaviman.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/bufasozalerejimezakox.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/nelonolapawifujotalew.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/xozirusebipasamexibemuv.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/26548554276.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/nurulaguzega.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/89999212671.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/dusogemi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/30447978d3702193de84002d01a8b995/piwizewuwakezawutesozigi.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/98693389161.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/74757894637.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/bulanidibemusolaxopexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cloud+gaming+emulator+apkPDF 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_off0000b6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CB 14712 bytes
SHA-256: 33206b7f2d670e91656d453b3c4a58519235fb48b1f759ce2a28164cc2a24b59
font_01_sfnt_off0000dbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 10788 bytes
SHA-256: 57452fc8a55a789f6da75ca18521b4afefedd650819539e665c461eb4a1ce0d8