Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a3cd6994c1422b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-10 05:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c92723489de9c3084d9ce8ee70f7c97f SHA-1: 39561e34949ee7931b9c21f9543b44e2248fb16b SHA-256: d3a3cd6994c1422b5ff193861dec2c5c35e045a007776625cc5fa6bad82219b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also includes numerous external URIs, many of which point to suspicious PDF files hosted on potentially disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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://consulcongress.it/uploads/assets/file/supumit.pdf In PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/kukam.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210909181947_148584126.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/50446115288.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/kabixolegifavagemeze.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090714483079624.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/gogevuvevexasefalajejo.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/mimijiwelinajuwogu.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210903_041458.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/661440539.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210906_2E868D0E9E468C6B.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/19754141683.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/junuvefonapomupisa.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/82150927048.pdfIn PDF document text
    • http://boldogelet.hu/media/sanojevokulupod.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/tiwagezutudevide.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/zaxituvajogamupubuxodop.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/bibigonivurevutilisurid.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/gudefit.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/40631678736.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/30712340223.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/buvobeziladomu.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/fitufefuragezeruwuk.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15354956148.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134062e13232---31206335922.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/voraradinutokifonuwupuvas.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ddb560f02---21555570994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=boo+york+full+movie+freePDF 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_off0000d6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D5 10268 bytes
SHA-256: 7ce7e96caeb8caf3c261807afd5026fc3f0fe76e8b266935043ec59a4b5acd6a
font_01_sfnt_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 17704 bytes
SHA-256: 66dca0ba1c1d47da1d6afe49962e573a57937e14e966466bb8e3197796099df4
font_02_sfnt_off00011be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1