Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9f99a7078ed9de…

MALICIOUS

PDF

73.3 KB Created: 2021-09-17 08:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 619418c94ad75ff18180eb09b5c1eb00 SHA-1: 3424d1e734be42747d38873b47b027e3867ff67f SHA-256: 7b9f99a7078ed9deb0928b5376fe199cef7ebf274b7d8e8d119bb6a32e1d4cea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious actions within PDFs. The heuristic firings indicate the presence of external URIs and a link farm, suggesting the PDF's purpose is to redirect users to potentially harmful websites. The embedded JavaScript likely facilitates this redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://geoodwierty.pl/files/file/xavadebezisotujisojibor.pdf In PDF document text
    • http://world-spa-resorts.com/dok/guzex.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/xotexixozogibodubaxaluter.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/dopuxit.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/xavusokovapimokeroninup.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/68934751357.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/vezawevemeduvifup.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/78642360928.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/97543723859.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/86621007479.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/49721787062.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/repijofeserefebovogitowuk.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/jafumodunatafu.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/4002872817.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139973e5745c---jagefuwufev.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee8fbaca95---11654519481.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/witaseza.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/sulufojajiluriguda.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/mutilogonuraxulobovufezog.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/29027953697.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/xuxubok.pdfIn PDF document text
    • http://kdekdyjak.cz/data/nofadopototowujijol.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/mejetu.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/dativesorarudinubovamuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=home+design+games+mod+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_off0000bd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD65 10576 bytes
SHA-256: d1d6d5d4eaea6cff63c5a091488095722aaff0064dbaa4745b8900f41ac6e448
font_01_sfnt_off0000d53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 16424 bytes
SHA-256: 8dcf90965a21d9dc90f3b127275205e71d266110869294fadae4d794019fd466