Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b604c4ed95f2ac…

MALICIOUS

PDF

63.9 KB Created: 2021-09-16 22:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 276ebd01293e836c20b5cb9225c70d81 SHA-1: 3c63ef5656c60d04418ae87c6646a8d5da6ca192 SHA-256: b6b604c4ed95f2acef0dde15c42d31d283b960f5a06dbcb2586a872da6ab041c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are part of a link farm on disposable hosting. Heuristics indicate this is a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8087

Heuristics 4

  • 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
  • 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://krisoc.ru/uplcv?utm_term=the+walking+dead+season+10+gomovies PDF link annotation
    • https://gkia.org/kingkong/userfiles/files/63195139005.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210913_062755.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/finevopiperakipupowuwasi.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/ridukufawidadisagadapigi.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109131006247421.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/wolokerabomodomupuf.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/nulukoxujunowumewolufuw.pdfIn PDF document text
    • https://buyafranchise.org/files/files/86387911093.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e459b8fd---61201653518.pdfIn PDF document text
    • http://kunbot.com/upload/files/kajopomevaj.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/23211825544.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/xisibosijebokeko.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/66752528164.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/tijixesatakulilefu.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/bipuripalebegozobadekop.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/xutesumoxekozavik.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/fonigafesorib.pdfIn PDF document text
    • https://tekmaker.com/upload/files/69730738607.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/nofelaxixutasasuguzawo.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/nurulofumirud.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/68ffb8108b76c683d5940344d4b33f58/muxonuwanifefinezanipuj.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/41974472741.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 18264 bytes
SHA-256: f17862468e03a5d0b66cb77a839e2b67fd921d93dbc2fdb94891999b6674afc4