Malicious PDF — malware analysis report

Static analysis result for SHA-256 6968cc6520685b23…

MALICIOUS

PDF

79.8 KB Created: 2021-09-14 13:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f925c50f281db52dda7842cf2752c642 SHA-1: 36687ea7cefcf55535201f97b985ad88034e1015 SHA-256: 6968cc6520685b238ea8b574d4a94096763d0d63703c1da795963e4580f255ef
134 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF's structure and the presence of external links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://essuances.com/ckfinder/userfiles/files/98095465011.pdf In PDF document text
    • https://huaku3c.tw/uploads/files/202109020151293127.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87969973314.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/roludapametetiturazofu.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/lizivosavanud.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/64797056561.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/zafalonewevegezavag.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/16810284434.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210907023118.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388d4f67e15---34273820703.pdfIn PDF document text
    • https://desco.scp.hr/files/31398052710.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/40746665191.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/doxujodatexutanibarevubit.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/8694787004.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/20496868828.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/gugutatasosatekamiki.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa43367162---75536209670.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132df23d123c---22282874579.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/nexaxexukutiwasot.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/voladok.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/35649087482.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/fatubudufu.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/xakulixivapa.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-8/20210908064905950186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=grand+gangster+hack+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_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 10664 bytes
SHA-256: 06e1d6fffcab1b9e88bdc75625b88b7666f750be914f0d6e098c644110522e56
font_01_sfnt_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 17296 bytes
SHA-256: eee3670e6da757ba7f0a8b1c1209bc7412b60e3c4b8db6fcb0c6a20025a83da6
font_02_sfnt_off000119cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1