Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d503f287056690…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 15:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74a21e68d8e345ab6a181acc08d9443a SHA-1: 7229130cac28379c38ae2b75fdec608e152abebb SHA-256: 05d503f2870566901130c4db0137a48383485eb4bd5bec475c92385747f480bf
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier strongly indicates malicious intent, likely to redirect users to malicious sites for phishing or malware downloads. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://archism.ru/uplcv?utm_term=nintendo+switch+phone+emulator PDF link annotation
    • https://fnb-concepts.com/images/uploads/files/62692623726.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/56544425721.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/21586641523.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/kajapekoter.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/34144859884.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/32283892360.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/47207155446.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/towujigozagit.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/34012362690.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/mebedigimij.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/tarekerurud.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091415154273499.pdfIn PDF document text
    • https://educhina.mn/editor/files/5425842838.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/851c65f1ed2d01e4ad1884af6351514d/goruvubiwo.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/diwuzowegiropolikojebo.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/54381532553.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/81525483848.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613098c51827b---61550251401.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/xilisimosanazikelu.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/witupodizuri.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/zejafobavemagarivobota.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/10409129983.pdfIn PDF document text
    • https://fjhi.org/userfiles/file/rurinetefavinemakiwusap.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_off0000d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 10940 bytes
SHA-256: 71e9fc515a1c21bd0f67f0d7f2dabe5dd282ce635dae3b4f6707f5085b73f3af
font_02_sfnt_off000106a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 18292 bytes
SHA-256: 8c18fcbfb6a3003c140a78e75268669795101965b1473d2a25014f4abca44cc1

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