Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e05ef91f4d616f2…

MALICIOUS

PDF

74.8 KB Created: 2021-10-07 17:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03d807f10ecd46bbde1ebd9faa735d26 SHA-1: b61df77ddf8525c5bbdfd53742a9753853de1f83 SHA-256: 6e05ef91f4d616f2a46d19952a4c166bdfdd503e2bc879dd8739639db067338f
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or initiating malicious actions. The presence of numerous external URLs, many pointing to PDF files hosted on various domains, suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://cakesandcupcakes.net/userfiles/files/xugasekupogu.pdf In PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/tolozazigod.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/bisatoxakowerepo.pdfIn PDF document text
    • https://ka-base.no/images_students/files/zedadakanapurogumowen.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/depopufimibufotim.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/jozavajesepapesitejojet.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161397164c3787---20013467294.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/raxivowasutinafujej.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/96422307126.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/51259700989.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/xesuzakevexazafoseto.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/zibokimuwuv.pdfIn PDF document text
    • https://andana.us/files/files/kovaranikumuvosimumaji.pdfIn PDF document text
    • https://cubic.is/userfiles/file/kojolirawunamul.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/95543418499.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/95970127126.pdfIn PDF document text
    • http://www.siposferenc.hu/html/paxivaziwukerupex.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/98380069480.pdfIn PDF document text
    • http://szwygs.com/upload/88498604896.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615999a50923c---kisixewuwumaz.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/73102259311.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/borumuvixumevibokakiga.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/62566581382.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/kexir.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/96230355267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=when+god+made+you+by+natalie+grantPDF 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_off0000bf9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9F 17816 bytes
SHA-256: 3103d6694ba37e4463d41bb1be3b69ec331bfd4e2f1424603a326a50aa61f134
font_01_sfnt_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 10876 bytes
SHA-256: 3ca91977abc6533371dc103fa2807528583ddd5de04c9c6ed7d33ed5d7effafe
font_02_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1