Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c18725b8c555d32…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 20:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 269f49ff6a68d46020c1cd2b8bdf0708 SHA-1: d501ee0cea54401b56e80dc5981ce21541c69192 SHA-256: 5c18725b8c555d321419eda20bf2331807ac4309ab5aef7751ece34c74f26822
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting an attempt to obscure the final malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts to host files, a common tactic for phishing and malware distribution. While no scripts were directly extracted, the presence of multiple external URIs and the ML classification strongly suggest malicious intent, likely to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135f6a7064d8---rewuxelokusegozifelaxit.pdf In PDF document text
    • https://signika.pl/Upload/file/30673794627.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/84443457757.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/69640713182.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1630891339.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/gasoroxavumepabemejijapoz.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/53609842116.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/vifabomaxewixuvokexadadis.pdfIn PDF document text
    • http://tecksco.com/upload/files/59058438601.pdfIn PDF document text
    • http://hybsch.it/upload/file/pinumoxile.pdfIn PDF document text
    • http://holzweiss.at/ratifiderozegixofa.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/netoxijatitat.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/58159692836.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/37996578628.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/raforuporaguvof.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/91017582779.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/xumiputufoxaxoburifiwoxaz.pdfIn PDF document text
    • http://ping-property.com/user_img/files/desaduvezefu.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/zesan.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/33228662370.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404e8bbe442---vofutizep.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/jefivabuxikufitupodumut.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/nofigolofugexibibufomuve.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/gotofemobigoxurunevufowo.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/monisojirakamatukuben.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pdf2id+2020+free+downloadPDF 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_off0000d130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD130 17244 bytes
SHA-256: eaa3ec1895d74dab3cb2705f60f6401cdb88225ac241ca84dfec5e9202f91ceb
font_01_sfnt_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 10408 bytes
SHA-256: 85c1f5e80acdc3536dbf40d9cf5e91f83e3583e27aa71672306696b8774881f0
font_02_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1