Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7fed63deb44ea0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 23:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7189e5ff61f535bb0e26da52849e15c2 SHA-1: 5d67c835daf782c67229cf4b6b3fae4358df9722 SHA-256: da7fed63deb44ea0c69fa93056c3fbc363105c3e2542a74ab026178a1ff1c395
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a deceptive link structure. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the presence of external URIs points to an attempt to redirect the user to a malicious site, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=watch+series+tv+shows PDF link annotation
    • https://udruga-invalida.hr/files/61531440249.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/30718735638.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/20357864910.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/95824251323.pdfIn PDF document text
    • http://farmina.ru/uploads/files/88120208210.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/rinunezunarekefumisad.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/temewufozovurarowewo.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/volugafulevug.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9e98bc16ad300a437a4da80f5df077f2/64148192523.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/39348964425.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/67461909150.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/sipowizobevi.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/51870150049.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161462f831771d---semedomoxuwujoliben.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109100929548580.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/98284595407.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/xatutamibomiwezu.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/budex.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sewesumovobifogefat.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/87703892726.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/jowizorotowozupukodopa.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/51337814559.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/82409420502.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_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 17068 bytes
SHA-256: 3d51d38352f7d21f814c63884d0f297b4d82648fe12f934e09cb6f9d6866673c
font_01_sfnt_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 10324 bytes
SHA-256: 233af77913388c0181aae80ab30e3c0784654f02f0bede49493bfbd24f581980
font_02_sfnt_off00011d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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