Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb6833eec74dcab…

MALICIOUS

PDF

69.7 KB Created: 2021-09-13 18:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 626ed62ce7cd825099ccd64847fd8fb8 SHA-1: 0181beec659ec675c69ea3e4ec9e5ef1a057c704 SHA-256: eeb6833eec74dcab11cc7b01cf99a878f5dce85b435099ae788e5b6e6e5a9e8a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. 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 0.9975

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 https://archism.ru/uplcv?utm_term=survive+the+night+full+movie+online+free PDF link annotation
    • http://ornito-silesia.eu/userfiles/file/77161025779.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/83956630094.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/63039640164.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/25847568174.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/kawovalu.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/43439372821.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/97043485083.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/70160482329.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7a6c35f503a19a71e993a29a8fa6b57e/kewigan.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/67733162260.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/56974745052.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/71700512593.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/fasovojukot.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/zuzalijifulotekumavixex.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/71884097916.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109030154331179.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/48179359738.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/32420450361.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/10696021524.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/82907619993.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/67521205670.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/39290028118.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/19832709043.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/39235292729.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/fidojazi.pdfIn PDF document text
    • 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_off0000b473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB473 10572 bytes
SHA-256: 3d4c2020a285a0ed00f0fe1eabe0180dbca5da14503f4c5fcc424392a456c641
font_01_sfnt_off0000cc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC68 14480 bytes
SHA-256: f32ed970fa0dbf7208b43e8c05ee16fc8649a3607e11b7c311e49d667013144b
font_02_sfnt_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1