Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea4a2f64ba7f804…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 15:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: df3edf5831419b420620ec3b99021d01 SHA-1: e36e0ceba47603cb702fc17569bc8c2fc4c5a114 SHA-256: dea4a2f64ba7f804d2fb9e30f6383fba3144caeb739260cde9bc819a03dda43b
166 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://eyela.kr/uploadfile/fckeditor/file/jerawagefiwitivux.pdf In PDF document text
    • http://weilandvloeren.nl/fckimages/62113563147.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/28516797345.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/87689720208.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/66465215925.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7a16ef5c15c031b68d3f6aa57262a573/60971798540.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/merowubalaxofus.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/zutebuwu.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/badopafakadutevopijaru.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/pupodaberuji.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/dajuxunotusopuvebelizoru.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f00f06af4f---nodizajoles.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/xowudegijevaso.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/62890405050.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/gulobiripubodifakawave.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/poduzovosaret.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/jaweguruzev.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/44170671048.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/85814527513.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/fukoragefewebadob.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/59676618195.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/56483998052.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/file/kiwogedagoluburarusinugil.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/nusadezuxodifexi.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61368425b1e22.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chrome+88+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_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 17604 bytes
SHA-256: edac90e6d3f4c8dac1b7fdb15707b58ea39e8b4012bed8b0fdf611bd7865c5e1
font_01_sfnt_off00011a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A05 10340 bytes
SHA-256: 344f35a05bab083e643fa95929ff39e7960cdbd6d0e3879b6c68caba6f531c4d
font_02_sfnt_off00013168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1