Malicious PDF — malware analysis report

Static analysis result for SHA-256 2807cc1c2c09a7a7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 11:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e8ad074a9d257733d223ca8b5d0e7a4d SHA-1: 3a19b9ddecd230c95f38419e7994d3540f3518b6 SHA-256: 2807cc1c2c09a7a7fdc8fd3242ef2c1f81d34432bfb5055288df188fc64714b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2ffcf27a---85024156883.pdf In PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/dozunutepukupapozo.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/lenegukukogizi.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/51881856764.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/051014292297.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/sevasaw.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/gikivazamaret.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210905114336.pdfIn PDF document text
    • http://bjjiffy.com/upload/mejirizutewobajemedat.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/jidodoretedo.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/lotenupelonalupika.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/50372152017.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/64738206485.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/xiledesu.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/53857445039.pdfIn PDF document text
    • https://uangraja.com/contents/files/68280924588.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/30349796514.pdfIn PDF document text
    • https://noddy.nu/images/file/16818150772.pdfIn PDF document text
    • https://servicepapik.ro/files/pumudevasutalimoxog.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/mekopojurid.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/basire.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/zopozevor.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/kogubotokosogoxituxe.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/43523727603.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/9282062242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=shop+mobile+legends+bang+bangPDF 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_off0000d287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 10856 bytes
SHA-256: ff65777945634b953d2bc3ccd2031bff1a350cc74cc088977ee9df407b9671de
font_02_sfnt_off000102f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 18076 bytes
SHA-256: e7190a1829f9738d3d9ef0ac5f6103850da200847417f4597dff1965cb47059e