Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e59d67b6671c14…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 05:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 369ef4996fc46dae461d884892aa9697 SHA-1: 9cb4b4f3fed7d0a670b588d6191ba3f38ed15d64 SHA-256: 25e59d67b6671c141e1940726d65926b67fea852ec7830101bdc4cd2c2eee598
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to download further payloads or engage in phishing. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://exosushi.com/uploads/files/kivufapo.pdf In PDF document text
    • https://bloomlight.pl/_bloom/file/xapexinil.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/gufaluf.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/mikanuxotonusanukadarawar.pdfIn PDF document text
    • http://korytnica.net/data/files/36686939245.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/xuzodemedaxofulexudawawaj.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/wujenilomarow.pdfIn PDF document text
    • https://yasacompany.com/upload/files/desaxadi.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/42629664482.pdfIn PDF document text
    • http://rjt1.org/upload/files/56073651356.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/26578096336.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/77972239287.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613986fbc0e83---70355642987.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/54681622440.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/sibevenisofevirijojino.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/77350933551.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210902051907598053rmv19.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141dc44e6561---99529766671.pdfIn PDF document text
    • http://askaudit.ru/price/gisalojiwomibavagoru.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/73138869178.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/3295863720.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/17096833229.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/bapubaxesovofaviro.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/xufiwosexokodefu.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/3066516189.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/75851410416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=goonj+tv+download+apkPDF 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_off0000d60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60A 17972 bytes
SHA-256: 85700b2f413888c007ac1fae39d2e329905c1d40e4a676462895afb84982948e
font_01_sfnt_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 10308 bytes
SHA-256: 9e4cd28c12413a93cc17360140fa372d014e0eb4dc5a3848c71140b40f1777e9
font_02_sfnt_off00011b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1