Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87d610215a60cd9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 19:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1aa133b7f45de0704b64962e51690bec SHA-1: 3b1620a78d6c94533c54122b62b71a746293ddf5 SHA-256: e87d610215a60cd9fde488349f4996f242633e6cdab00495fe74b63d89241ae6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely facilitates the redirection to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous external URIs. The ML classifier and ClamAV detection strongly support the malicious nature of this file, pointing towards a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://rudolphalexander.com/uploads/files/vuwomunet.pdf In PDF document text
    • http://metabolizmusonline.hu/images/upload/file/39801175320.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/64587914914.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/40964112672.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/039de5afd613d70feee65872369c1dba/gibixejera.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/pelupadunujigugon.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/72853256776.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/nudikofiroweveka.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/furanutorobewogemitomas.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16305844621970637385.pdfIn PDF document text
    • http://origo.ws/userfiles/file/jovefowavavajafepa.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/jirugosanipaxus.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/murawozopeb.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/73802085320.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/7194021564.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/zoderudori.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/68566298529.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/93112506390.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/16162000208.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/bigokudajakoxuwonij.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/38471949305.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613417ce65a39---35876100154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=demon+slayer+mugen+train+full+movie+123PDF 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_off0000d345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 19712 bytes
SHA-256: 87eddd9162a191d77743ff8f64b87ca47d231e3419ac8676a342bcb741e6de9b
font_02_sfnt_off00011f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F09 11180 bytes
SHA-256: 64204989aa127716fbf8d6a2845fd759f0bebb443b6f9eb4424f0c35e2092bb2