Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5cbbc0441f0a18…

MALICIOUS

PDF

83.4 KB Created: 2021-09-11 09:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7eca1374165736abe07e8c088f9b573a SHA-1: 8efba03b8640606c5fa4fbdc68b7d41a09568d55 SHA-256: cc5cbbc0441f0a18225a214cc7297225d3fab3fce5100a5e55f01b087f2af46e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.smartlandgroup.com/ckfinder/userfiles/files/62577386955.pdf In PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/82711510688.pdfIn PDF document text
    • http://a899.net/userfiles/file/wegedurukibitije.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/53175527627.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/18325104184.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/magoxizezojafad.pdfIn PDF document text
    • http://friulanapanini.com/images/file/luwadavi.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/22853801652.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/62344612759.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/lesukofemadipoxokuraleli.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/neposofexifobavazipexime.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210910000645954.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/zikej.pdfIn PDF document text
    • http://4darchitecture.org/img/all/dusabinojaw.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/35389774320.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/15147744908.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4d04e8445---96068561724.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/jodokijuburunewumuxeb.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/1718005139613a85c07566a.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/20627851981.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/60369624300.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/5475861090.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/50289301722.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/75842874239.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/tuwukesozeneguku.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137949648a3c---56246921572.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/kexixapevakapatemituda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+house+on+the+edge+of+the+park+full+moviePDF 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_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 17192 bytes
SHA-256: 7829fdf85affc305961503b2d61479da1c3bb6a2612c9f2517e9dc5b0de75ccf
font_01_sfnt_off00010d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001253c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253C 11164 bytes
SHA-256: 94f4815cc4e743072792feb7a3c66cf7a3fc358c1aee8f604943cd417589b414