Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d0217f0e15f3b2…

MALICIOUS

PDF

75.5 KB Created: 2021-09-11 05:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0337965fda545ddf06e21f4ed613c4a2 SHA-1: db4e60b9a1e34ccbaf99132e4b05bd30289b9c7b SHA-256: 22d0217f0e15f3b2dd75f9b633cb5a5fa10ca3f1cc248fd7f84c63ab9ed769a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying a large number of links on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bonsite.nl/phpcmsys/file/72485658598.pdf In PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/kakelelajikaxozuxow.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/455964563613b23d8db8cb.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/8680164158a936a9d2bbe8b26b53ff2b.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/zifubemad.pdfIn PDF document text
    • http://grafitym.kz/files/file/vapatirolapikaweveg.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/42591803960.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/suxusuzubinodis.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132387cbc116---29330347404.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/vuleno.pdfIn PDF document text
    • http://grabnerestriche.at/33102258694.pdfIn PDF document text
    • https://csn-alliance.com/data/files/51332686380.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/7388278405.pdfIn PDF document text
    • https://sealskinz.ru/files/file/22380994384.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/newutexesimela.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/firega.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/zesenodarepegenu.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/zekedowodoponifawesinebab.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/jibufomejojerukumidi.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/39485181021.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b16a9c90cabcb166b3cfecba5f02e957/4786092940.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/tezewegegopobuwibo.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/81829345784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=wwe+2k17+real+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_off0000c32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32C 10056 bytes
SHA-256: 40c03b8c19bfa093d4de5baac492d8638b6e85fabb6b33ab9bfcfb1a5a53055b
font_01_sfnt_off0000d9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 17988 bytes
SHA-256: 495c74b8d14143bcd084b1bfa035b9b9a90ba5fc91ba269d941000bd19591b9c