Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd8fc3103f2442e…

MALICIOUS

PDF

75.7 KB Created: 2021-09-19 19:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1212d914866559a3eb63fddbddef3b0b SHA-1: 9957b7f2caafeb3f7c5a5b313d41de16c8b8891f SHA-256: 4bd8fc3103f2442e2ed1892f71c380a8e53814bcf9cf5b4e1422105869477fa7
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to one of the numerous external URLs found in the document, which are characteristic of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://xn--9w3b11kh5l.com/ckupload/files/tuxizigudedisovuzetosow.pdf In PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210911011635.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/62339648693.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/438e55fa5673b86d71228d7802d3d358/63551321813.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/83674193024.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210905/file/16307836306987.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/jixasa.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/vumeturonubotebefaginaxak.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/4619690041.pdfIn PDF document text
    • http://fitviewer.info/files/file/41897588962.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/vewimezoxemakenuwalip.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/xijepuri.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/1173880043.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/29116843728.pdfIn PDF document text
    • https://halkum.rs/files/zusakofiva.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/62233756064.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210918_7E3EE6F037F6602D.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/dolawusinonanajowanix.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/46788643654.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/gotawara.pdfIn PDF document text
    • http://perksys.com/userfiles/file/nebomug.pdfIn PDF document text
    • http://mosjob.ru/images/file/zerekenujutef.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/sozod.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/takisapu.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/96171334180.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/zamasosewazawinijefugoniw.pdfIn PDF document text
    • http://planetamama.ru/files/file/loviguw.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614319444752d---71870003886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=john+wick+full+movie+englishPDF 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_off0000c51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51D 16816 bytes
SHA-256: 461e2a768d4d61a3a198ac53359d1a608e59e3da0f9b36a97e9dcda825add193
font_01_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 10760 bytes
SHA-256: 39c44af116c185c2e4e71ebcdf9f334a68eaa144d262302fc28673edbef0ea9a
font_02_sfnt_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1