Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8323e0364e1931…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 20:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dcc61a2f8b52a48dfb7d61615829ccd9 SHA-1: 324d3e37fedfdb6155022ebfa25ae6330749689d SHA-256: ba8323e0364e19310cfaae6db1012a91667140db6bf19ba129210002a03a5c30
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable domains or are structured as link farms. 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 executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 https://oferta.lt/i/File/90348426281.pdf In PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/zikugaliw.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/944gr2625ph9d2jpgb5v9mdlq0/jaluzijakigamerekifelebu.pdfIn PDF document text
    • http://talleresjpg.es/img/file/63304336714.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210918_193405.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/12979498718.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/63163291106.pdfIn PDF document text
    • http://matrixpaint.com/ckfinder/userfiles/files/dorazolupunefexipuk.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/tupiguwavikowugefosuvi.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/besirowumuzid.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/14655883888.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/fuxotifopalulu.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/xozalirisu.pdfIn PDF document text
    • http://malifer.hu/upload/file/75097274383.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/fuberigifemovotalin.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/jurizugop.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/81419278219.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sizajorabi.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/49206038207.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/wobujijemafixesa.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/60871604958.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210904065516.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/74379777719.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/51189057836.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d25b3e1dc8---zedorojasunesesematujus.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/72335577610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=anime+battle+3.5+unblockedPDF 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_off0000b1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B3 15568 bytes
SHA-256: f690c455262cd81298e1e551a8d9250b4ed71acb343afe1794467ff140fc1574
font_01_sfnt_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 10948 bytes
SHA-256: c3cb81bdb5c64b3516c7fb4bca982bacc4a7c407a7ab02e9d8a3df6c5468ab06
font_02_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1