Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb680a412bbd30c6…

MALICIOUS

PDF

86.3 KB Created: 2021-09-21 23:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 64ffcd7f6bb7b3ca6a142dbf59db2424 SHA-1: 6e1f788b6b9a476f3849570ea84f04633d5561ac SHA-256: eb680a412bbd30c6b9298ca0134364f3dbfa849493de487679dfa6807b3461d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which are hosted on disposable domains and appear to be part of a link farm. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate the download or execution of further payloads. The link farm structure, combined with the UTM parameters in one URL, indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ambcavallon.eu/userfiles/files/divizesefizasofisu.pdf In PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-1/20210901170903665753.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/vuvatgphr669vltug07dfjcks7/xokikopewugorugewaj.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/7478526641.pdfIn PDF document text
    • https://fratellifurloni.it/file/94694354953.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/51997177859.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/fiwufokenesepiredi.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/sezakifov.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8e1cb1f25---remotizivulojetifalamani.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/97771699723.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/67752393096.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/wusamupawumituniz.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/deninivuv.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/padizozulorunenuvul.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210921124715155.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/relasotiw.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/12344469443.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136656189ea0---43653825673.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/finapidamilazinebuw.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/14056582520.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109121424202396.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/66749754855.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/kanomemumig.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/lopularonadazudejinaw.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/nulebopofipezizox.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/2482321415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=kingroot+4.6+2+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_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 17216 bytes
SHA-256: b22ae76723e645f9e44e754a97c74b7a5431b85aced745b897107e71f98f5c13
font_02_sfnt_off0001327e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327E 10868 bytes
SHA-256: 9a9184286f236538e44138f3c77b58e275fc2f426feadb0f7465176bcba2904d