Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a062ecf40986f8e…

MALICIOUS

PDF

69.9 KB Created: 2021-09-18 13:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 36c82dc04c585ab77739ef871b3245f9 SHA-1: fc93742fa7a2ae719b9f4a72cf2e8e25d458e062 SHA-256: 9a062ecf40986f8ed69fb263c63a2110869c1099c737d42c6bff66465aa81e7e
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 part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://cructi.ru/uplcv?utm_term=emoji+ios+14.2+download+for+android PDF link annotation
    • https://exihomes.com/userfiles/files/pazizomigubapa.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/vulasitidukonoguj.pdfIn PDF document text
    • https://mihalex.by/files/files/xofarefozofewu.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/18117139771.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/76903702954.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/20387663356.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/92721151521.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/86947379012.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210914200503.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/80575582339.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/98096760179.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/16952812144.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/rolazuvas.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/88127281723.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/60772093054.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/wimoxikeravom.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/ranagobol.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/18059455937.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613990958c924---venaragujabiguroretivape.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/13906209527.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/xudabazunodaditugobi.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/fawebidigavinawenunonona.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/6931266dcb53ff64cd563fd57941a27f/mufitenerizarava.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mejilejumilisasazofejavus.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/foruzekib.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_off0000b3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CE 15548 bytes
SHA-256: 39e95d68d1e9a1a371c024a95b9411e096adf39b6c96488638837c795c2af4cb
font_01_sfnt_off0000d932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD932 10800 bytes
SHA-256: f2afe913a89c2258650a37c8c4911e033b10c1523a814ffb0c9b6643d828ea72
font_02_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1