Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe58aa43d5b6148e…

MALICIOUS

PDF

86.0 KB Created: 2021-09-08 17:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b88847301dbc0bea89dc56b26f89eb28 SHA-1: c3bbb4328bf023ffb18151785d87c55d6bfe1419 SHA-256: fe58aa43d5b6148e7d5cd51e395f7d2b6cf968027d7c24fd69890430c857a84e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute actions. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm, and multiple unknown URLs were extracted, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161371141538e2---69293015698.pdf In PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/xovugaf.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210908105522.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210907210829061208zkfais.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109081054046522.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/19409012555.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/pumepuxazuzo.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/98887099633.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/lajomupifexamivalug.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/29044227579.pdfIn PDF document text
    • http://kgmda.com/upload/files/29172464096.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/40147595736.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/71555706169.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/vamerikitoxajamaxedodes.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137d13a93460---42025108028.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/xufasibodinopipelanuximi.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/kofaginawulevanub.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/70697550811.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/vuzevowojabulefodaxezufu.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/bidaf.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/46666682850.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/16643641411.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/37379841221.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/79410947933.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/jimugibezodonobuxalarerax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ductile+damage+abaqus+manualPDF 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_off0000ea95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 17704 bytes
SHA-256: 315f65786ecd140b18c10a565d69f84a967b617d387959ee9679e05a9cfa5f45
font_01_sfnt_off00011871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 10880 bytes
SHA-256: a09a75e20b41e914a26b87edb499ad9c2fa5faba4331dcb88801be5477caaf5e
font_02_sfnt_off00013110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1