Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e8b8b572cd9b61…

MALICIOUS

PDF

72.4 KB Created: 2021-09-29 12:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3172b44b6e5d8b4aa3d477313a264381 SHA-1: 4c9b51b55c2a2b04d268718a2eacb9c3fffcc12c SHA-256: 59e8b8b572cd9b6171d7614f700283ab7c294cc3a11fc2155fb1a3cba7a1293b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of a link farm with numerous distinct hosts and the 'utm_term_redirector=True' flag suggest a phishing or malware distribution scheme. The embedded URLs point to various unknown domains, reinforcing the suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 5

  • 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.
  • 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://rafaelstore.ru/upload/files/92464829223.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/9201291108.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210916011805.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/wikapalufuwiwugexedopivo.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210915200503.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/94852772050.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/28612157442.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210923030427.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/xosirisav.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/vulegobadilatanafozop.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/wezirivofitas.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161381ed173be2---47366041920.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/nudoginovubewune.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/zikanuzoxubowev.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/fosafevasupovoteba.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/41880367064.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/soruwilav.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/12330972446.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/79269378936.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///worujiramoforaw.pdfIn PDF document text
    • https://mmszke.hu/files/file/75068505208.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/d9nrlf9b6r0bvelh34tkkdpvpc/kuzotelosozatinasoxogaj.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/16/wadavatosegoxugoramodawa.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/67412289463.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/dotalu.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/rumebubufuxasubamir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=nexus+7+2012+recovery+modePDF 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_off0000b69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69A 16964 bytes
SHA-256: ae5f9bf5012518aade1ce5d74f34d2ab5189238f0714cc416b44169a44db9e37
font_01_sfnt_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 10732 bytes
SHA-256: ae61cd0bc753e229c9353c85291c03d41fc3e73cc32915505fae2c75f21e10cb
font_02_sfnt_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1