Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71fae0a87aff39d…

MALICIOUS

PDF

78.7 KB Created: 2021-10-04 13:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1e663fcfea356dfffd14ccf5046e3e3b SHA-1: 28562d0d78bace41da7427be8cf4dc0dc919d451 SHA-256: e71fae0a87aff39de40c04efe72878ed930ccea865822ad7727b13e30eed0eca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • 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.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16148e2c41b343---rabugujixulumejisunofa.pdf In PDF document text
    • https://taucaotoccatba.vn/images/news/files/67142148454.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/18281282227.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/mopekomopom.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/86517565681.pdfIn PDF document text
    • https://jetaime-shop.com/files/zigolum.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/nanejuwamatagora.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/55287190373.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/86391367410.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/bopojeveguzetu.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/wemix.pdfIn PDF document text
    • http://haphadoor.com/upload/files/safobokuvaje.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/gunexovorifemujakivida.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/vizadamo.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f10c9c3145---povekajonuwodamu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/peluxewoko.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/xubaj.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/bufatolatemosuwomon.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/55035621995.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/fikitasoxedag.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/sazedasofoxuzivikabusiga.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20211002193148_604884519.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/79332235509.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/61810363203.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/titemijepugisapitaga.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/raludaloladimisilan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=family+planning+multiple+choice+questions+and+answers+pdfPDF 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_off0000ca5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5B 11488 bytes
SHA-256: c0381b3d273c8c163495f118a709dbc7543075e38240ceaeaad1fab32783bb9f
font_01_sfnt_off0000e4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 18012 bytes
SHA-256: fda9042e6f5ec908035e99f04f90cab5cc821c06b4729c6abf88bef7d609691f
font_02_sfnt_off00011426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1