Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ddc849cbc92a75…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 23:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e013c91b06f193c0ce85f6c07edd27b1 SHA-1: 349a1729a7036a12cecc29e58e7ac94dc520bbd5 SHA-256: 99ddc849cbc92a75c52680737f5aa27b4757943efd4ee8fcd4d3ae0eed7116be
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the purpose is to create a network of links for SEO manipulation or to host further malicious payloads. The ML classifier and ClamAV detection confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://zoekidsworld.com/userfiles/file/nawiwepaxu.pdf In PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/51066825588.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109131058110760.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/71893860143.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/murekutanoguduwisaniweka.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202195123439.pdfIn PDF document text
    • http://atek-ent.com/upload/file/91656115100.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425d89e567e---80318603719.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/lediwabituw.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/sikakuvasemudububidun.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/36824114358.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/nazosu.pdfIn PDF document text
    • http://www.polni.si/Images/files/wejex.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/vumivodama.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/zupawum.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/wexosizoboz.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/buvezurixegebutuvusuk.pdfIn PDF document text
    • http://samtle.net/ckupload/files/57672804087.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614be39dda50b---lumoduxegabu.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/39219398250.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/66360858346.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/72661945156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=jeepers+creepers+full+movie+onlinePDF 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_off0000b0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AA 10540 bytes
SHA-256: f06e843a2b52431d5003e3ce2efbb917ba011b3d05b08acecfc02877b3a4c5ba
font_01_sfnt_off0000c8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 14732 bytes
SHA-256: 249157ab5bf0c427e0ed80c427852cc5cfec00897664c88c19f3364b2c57f864

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