Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bb074908228807…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 05:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 64120542a4455a4744517d109392e2bd SHA-1: a829e41dda68e9870dfa41ec9ba31455b23cb41f SHA-256: 97bb074908228807d36e2fe4031006ff1b88baef491803e5681da9dd4c1f6787
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of links to external domains, many of which are structured to appear as downloadable files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute content or phish users through these links. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://crystal-lamp.ru/uploads/files/21103598160.pdf In PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/32084022318.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/lizoniko.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/jalemigaporeguvominu.pdfIn PDF document text
    • http://12shio5.com/contents/files/27189792833.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/vexedunuzasesoxopafimu.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210904_9EC03686E1B69DC9.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/38578897106.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/setovo.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/xemejopixidu.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/kodiremodage.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139aeed6b202---80642463232.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/51611870071.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2951ad4ea---81297372853.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/65713814726.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/63055931054.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/62012802889.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/mikerepotafeg.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/52070695670.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/78946173191.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/verozami.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/degekigofuzuxodumis.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/gofitava.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/zipadoboxikutasafi.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/46291153720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=watch+step+up+2+the+streets+online+freePDF 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_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 10792 bytes
SHA-256: 9933cfcb20da31c2c690cca15af0148d626b6849cab9ed2cd42f69acf1d01511
font_02_sfnt_off00011134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11134 17684 bytes
SHA-256: 5da57d3d3289050f083f4cdc33d4931e439aff65a87072b70582170c58210b50