Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf81a9173cb5d24…

MALICIOUS

PDF

74.4 KB Created: 2021-09-17 15:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e234fcdc17f9aeff9205fd1d149117cb SHA-1: 623020157f701ced0fe6ee723fb6abb519d7c1f3 SHA-256: bdf81a9173cb5d246089c7ae053cddc1c8f825e28e4063d5439bdc3f830590e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, one of which is hosted on disposable infrastructure. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs suggest an attempt to redirect users to malicious content, 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://essentielles-theater.de/UserFiles/File/wigojoreberakixizavo.pdf In PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/27122110987.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/gawivabakixijubimewevi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161358a24b3853---kifurudon.pdfIn PDF document text
    • http://npas.ru/pic/file/papogof.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/sebesanezikatozulizasijux.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/kufax.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/gajadugimibogixe.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/18176423696.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/wenoridomifukok.pdfIn PDF document text
    • https://digiconelectronics.com/media/76688639695.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/27478709643.pdfIn PDF document text
    • http://a-pluset.com/userfiles/zoketula.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/babofabagavanarejajamizok.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/bebuvonuda.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/zerenivosokumivitozis.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/ropamoverimowoxosasupul.pdfIn PDF document text
    • http://sinners-party.de/media/file/3707468741.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/gogekevufovawikujim.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/luwokakevudamejaxeze.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/lexiwotugesofuw.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///xopizubavika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+take+backup+from+old+phone+to+new+phonePDF 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_off0000bfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA7 16808 bytes
SHA-256: 61ca6874e34431518f5138dffe595ae4a8b3c583d2d5cfd5c731d0be7df3c2a7
font_01_sfnt_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 11036 bytes
SHA-256: 56a5bd3509a0d43f544704a8793e29ebf32b7bc2fea6632815c417093dba8337
font_02_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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