Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4da4f08f05f265…

MALICIOUS

PDF

101.4 KB Created: 2021-09-17 09:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: caa03bbfaeb86f3ad2565bf7efbe2aa3 SHA-1: 4a01169e630c0d69973f7946b3d7141e1702051d SHA-256: eb4da4f08f05f2651d5430221794f2f2ce602ea9063ab8ffa8062a6467048ca0
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to the overall attack pattern of luring users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

Heuristics 5

  • 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://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324eaed05cd---vesuxumanu.pdf In PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/46840320084.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/72394589141.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/redafiva.pdfIn PDF document text
    • https://telorgabus.com/contents/files/14091663430.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/vodomuzowe.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/59393705079.pdfIn PDF document text
    • http://boxethai38.com/upload/file/kiziwuwabewapedasuwalo.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/dikokuketilevevebifivu.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/5477406651.pdfIn PDF document text
    • http://sun-eko.eu/files/file/sufokujowofugane.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/68931225245.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/fodugilafepadixifu.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/disut.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/83676699516.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/navixeposevigafiradej.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/dozidazaf.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/gufoxakakorotibafafebiru.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m0ncblmhrob053i2givv7kjh45/31503433799.pdfIn PDF document text
    • http://edeins.com/userfiles/file/63020423520.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210912_20D81631D6825A48.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/dijokijoxer.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/79297514316.pdfIn PDF document text
    • https://euchebnici.com/img/file/fapofaretenakariwurede.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/67013854762.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/newerojuxifosililabu.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/23890856193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=b%C3%A0n+ph%C3%ADm+ti%E1%BA%BFng+vi%E1%BB%87t+t%E1%BB%91t+nh%E1%BA%A5t+cho+androidPDF 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_off00011357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B69 31184 bytes
SHA-256: d963f566819d0139e127095852e4abf2a51457ab3d118a45f20aead35f62f14d
font_02_sfnt_off00016a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A61 11740 bytes
SHA-256: 5ba8fed7f8341868cb9e4da25a55f2ffdc449bcc334ec8dbd0a7fbea82602168