Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d5c14ebb55bc8f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 21:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed90e41f2f3c3c371eaf8ca80c577a2f SHA-1: e8e0724c85ac8066b2fd21cd64e5b94da84b6cdf SHA-256: 21d5c14ebb55bc8fccd1708e9b65b55db0ab398a835c495718a0d7f5b2f9554f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm with numerous external URIs, many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • 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.museopizarra.com/ckfinder/userfiles/files/65873293298.pdf In PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/58645264098.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202197184635928.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/bavewegivajaripavexad.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/75513252218.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/1981417482.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-10/20210910191305610842.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/xomisitanedev.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/mopumojutetareweverelubis.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/31914088104.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/ragidujojolaveravubanuli.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0af3972c---kosavakekefopime.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/14360401622.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210911160922.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/jiwoditorufafebet.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/rofabadekigigapenevafovef.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/24680876788.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109041624058250.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/bidelomaxasezevap.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/torugenivadirewazedub.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/nefanusuxut.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/46841174743.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a98ada91eeb370b3e03f626c0ebc6b9e/37388706214.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/baa3f1b7c8c776eea43036c0b02ddf31/lalosodiguluguvibuv.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/51691599984.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/nasesixakagukologijukuni.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/46042742540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+ios+mmoPDF 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_off0000e029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 9908 bytes
SHA-256: ac2604d6c579652208f87b691460e115f7e2df0432930d2e9efff1151d36ff7f
font_01_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 17276 bytes
SHA-256: 9b19ddd2047f3cf5bd2dbd874191710ed3c4e1dc86d57fedb3d0dcebdd8c75a4
font_02_sfnt_off000122f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1