Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf5ca5813dc037a…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 21:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 350d239bfebb9ee3d065be0eaacb406b SHA-1: df1fefef1b3aebedc3f5db12ce9131cf26b7d395 SHA-256: dbf5ca5813dc037a56335d8c8a039e975d05a583adf56d6384be2c8465ae9de6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hzqljsj.com/images/upload/File/ginojupibibevasew.pdf In PDF document text
    • http://someteme.com/archivos/_20210912165450.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210908_6921708743A86DF4.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/lalafakevatugolabiba.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/zomutafojapufiwowi.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/74939364821.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/57040071685.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/pezetivuwegurunu.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/79392170969.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/zawuraganodowume.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/37389559722.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/29114698314.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613439800b4e7---nuvolatodasonevexajof.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/5025229183.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/egm3k9c6uvc1ujjeim9gqikiu2/74523256132.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/5931405909.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/75795937580.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/82611118856.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/xavuzaxitedubatujej.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/wazebevupexesuvunelim.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/13687206873.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/bilunamizonof.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/110852332633.pdfIn PDF document text
    • https://langumeistras.lt/i/File/luvimopoxukosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=baseball+star+mod+apkPDF 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_off0000e54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 18576 bytes
SHA-256: 0bc9336ad6ec878537c16abd5d620fcd6d27f1f0f1fa3c61c1ebf8ead0cf183d
font_01_sfnt_off000115bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BC 10640 bytes
SHA-256: 11ef565c05858ad6f062b40810ed3823188ef7a48c076decb6f36b8f45a12dd8
font_02_sfnt_off00012dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1