Malicious PDF — malware analysis report

Static analysis result for SHA-256 204e9fdadb8535ee…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 15:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4bbc994ea592a33aa693c23d8cbb139e SHA-1: 57cf6a43ac6a55f1cea90355a95a8fa05f48fd45 SHA-256: 204e9fdadb8535ee92daa62c8f3937dc27c3d5f65c027c5ce1a2efd3254be094
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier strongly flagged this PDF as malicious, reinforcing the assessment of its harmful intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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://egitara.com/upfiles/files/55128040212.pdf In PDF document text
    • http://pjzhengwang.com/upload/file/20210923_211100_135.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/77083193488.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/485591842.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109040949169622.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614f16da91b71---89298745955.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/wonesozokiwovojinipat.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/43234673853.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210926_173831.pdfIn PDF document text
    • https://draw.pt/home/drawpt/images-editor/file/dazawogi.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/dabumef.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/38420973673.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/xeposuzekemuw.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/20/xupenigosus.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/94848427734.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/jagilikax.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef04b56fc7---98590734751.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161374e7e18b97---84100921494.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/36241957804.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/fegibujo.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021092320462633.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1632302579.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/xazelejesakewuxo.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/16703947596.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/wiwobokezogopetera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mate+20+pro+android+11+updatePDF 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_off0000b0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BD 10560 bytes
SHA-256: 3de80679ce4e84fb4698b2b7a504972d3053fdecf04ed489cea907814d8488d9
font_01_sfnt_off0000c8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FF 15628 bytes
SHA-256: f2c22cdcaaa2b19872adf951bd4b97d2ddacbe3ddc36811085aeaf0162498102
font_02_sfnt_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1