Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3c8f3f26942536…

MALICIOUS

PDF

76.0 KB Created: 2021-09-09 00:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0dbcf5b2993ae59858cfa3c47a28d1fd SHA-1: b7f19c3d338d6f4d9e5f0975afd95dc2ee069b12 SHA-256: 3d3c8f3f26942536cb5ffbbb474c03b2eef31335ef66864bdf815e67bdc07e65
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest a phishing or spam campaign aiming to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://studiofagiani.eu/userfiles/files/jaxup.pdf In PDF document text
    • http://zjgjqmr.com/v15/Upload/file/202193858115302.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090701114378.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/dalasuzikowul.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5g2olutd37in2an3cdkbdg8v46/13457581257.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/63539116269.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/nagurufizilukigupexemuko.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/nemizojadoxigopozixub.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161336dd566da5---9036532463.pdfIn PDF document text
    • http://yibetter.com/data/files/keduvofexejiziwunisipa.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/71811773774.pdfIn PDF document text
    • https://alkoplast.rs/files/32166928020.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/16021934708.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/suwovuvuzujijudosuxu.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/nivizazibejifomigodomali.pdfIn PDF document text
    • https://proxus.nl/file/37106619569.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/8589503221.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/neniwelezefukewesizol.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210904020008.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/purufoberu.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/kivus.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/moruxoteronutarezekemet.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/74861118593.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/70780414192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+go+mod+for+iosPDF 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_off0000c44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44E 17924 bytes
SHA-256: e110889f526191cf254386a509bc56ca9692be78cbe09501f4d3d03ba560c72a
font_01_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 10484 bytes
SHA-256: df3007a1f1089d405b97ba1e31b286c4ebbeca5d09645a0235cbee5794273e75
font_02_sfnt_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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