Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0f60aa8e9a049e…

MALICIOUS

PDF

78.1 KB Created: 2021-09-10 14:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a555492c2d2eba45eb6bc04e5bbb45a4 SHA-1: 9a2f5c6608d7c0ff98c5112b89b4e9c1bdc5b28c SHA-256: 9b0f60aa8e9a049eed26d223411afa00c76ed53fc3e28a7336fedfdf0d912d3d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to potentially disposable hosting, suggests a link farm or phishing lure. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://puntolinea.org/userfiles/files/bukexu.pdf In PDF document text
    • http://www.themixchange.com/userfiles/files/xeravagupuzepopewoxuxodob.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6cd6ec66eb17136dc92fec539e6c0afa/jokepax.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/mekagenixolup.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/lijavegikexefap.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/regodixowagalojobusigom.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f087cc0a46---78680067380.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/78434771089.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/gudejepowe.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/kuxamoli.pdfIn PDF document text
    • http://prmakeup.com/Image/files/bulimudogugilabek.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/kuwovebarewaburok.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/lebilubu.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/8831189856.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/15196057972.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/22170069233.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090807084371.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/gidusetujonevoxusopuxome.pdfIn PDF document text
    • http://chinazzjx.com/d/files/bupijafatamupefirokofewu.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/53719211588.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/kuxukaguwo.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/48259936722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=moto+e+2020+tutorialPDF link annotation
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/12868366978.pdfIn PDF document text
    • 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_off0000cd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 17548 bytes
SHA-256: 5c289cc4004a89d64ce576e256dec95415506909bc61b8bb8952d2f811e20160
font_02_sfnt_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 10164 bytes
SHA-256: dc674dda238c5cdbbb5e0e584cd20a830c8e1544dd82bbdc8a3d753c9921f8d1