Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58d9df00376b811…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 11:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3870a9c6c916c5379abbb012c55cee77 SHA-1: 588e19e49471ac65ed25e3362544eb2de731816b SHA-256: b58d9df00376b811f48ec044a4057cc2133c429de6e26af85629b6543b05c154
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to host a large number of links on disposable domains. The embedded JavaScript likely facilitates the redirection or loading of malicious content from these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://groupunsur3.com/contents/files/89301487245.pdf In PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/nawiwenabakik.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/padefedeje.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/84882661310.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/60012288725.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/gawokofavonesilowuvunes.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/63686098229.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/70308482234.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/ganom.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/podijudavudadoligadoke.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/42417024734.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/rufowesivoro.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9ff171ca3d6d3b1fa191d89647735222/wexubinopotajetov.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/moxuvedelarotofuximitajuf.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/44664836445.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/84276136584.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/74618739685.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/wutub.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/magaxe.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15554861818.pdfIn PDF document text
    • https://photofetimages.com/10558549426.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/27735654891.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161382b643bbfd---82874441747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hillary+clinton+book+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/68691859840.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_off0000df71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF71 17232 bytes
SHA-256: f51bb10b6c7ebc529068ba5085aa347fdc70119610d390365eef92e6a59fb230
font_01_sfnt_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AA 10648 bytes
SHA-256: 87768e5c98c3a22bfc5b9b40eebc11f4a980980a5e7c610828ee021107461093