Malicious PDF — malware analysis report

Static analysis result for SHA-256 22bf98a4284c808d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 06:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 77db3c12c1e7d73f37c6d9984f15ba08 SHA-1: 87990a70a6c8017b9a7f8f1a349c2b96b35ad18f SHA-256: 22bf98a4284c808d697442d1d9cddfe0a87f8499e23e83d6ba4a7278d0f4b7b6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the presence of numerous distinct URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the structure and URL patterns are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.europesolidaire.eu/userfiles/files/59719218063.pdf In PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7c730f725227a6d6e48ae8de73cdde62/bawilusesu.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/47342149814.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161315eaf15de0---badomiramu.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/tetopesupotim.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/zulorezejovoli.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/68631113774.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210906160239.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/23913732014.pdfIn PDF document text
    • https://stotex.rs/files/muribabimarizo.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/34407334497.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/33979129827.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/tevimuwekizere.pdfIn PDF document text
    • https://fond.ru/userfiles/file/11044014631.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/97188702502.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/77240461428.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/zumejeseverugupomunafapid.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/60867100918.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/gifojuderezajowekenajubok.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202194116537119.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/69765645536.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/nimoxibapamikifavoju.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/rojid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=kingroot+pc+64+bitPDF 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_off0000db7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 10420 bytes
SHA-256: 56c8bf7cbc1f44b97e8e2e6a9d8c0191726b1cb466efd72174da0764aebb84dd
font_02_sfnt_off00010b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B11 17848 bytes
SHA-256: d90937402faca0b492fd2bb993c277c6756c17c48fd244cdc7d7134bf0e0ba77