Malicious PDF — malware analysis report

Static analysis result for SHA-256 8868be16b6436b4a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 17:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e00dc73a6f82c6d294c0bdd1aa93f772 SHA-1: 85886f570fba96cff9b2de99d14c6245ca862c5b SHA-256: 8868be16b6436b4a6c0b009a1ebf4a8ad18ffdb2a8fa8037b91f8b273d673abe
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM indicates it is a link farm designed to redirect users to various external sites. The presence of numerous unknown URLs, many hosted on potentially disposable domains, supports the conclusion that this document is part of a phishing or scam campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vanrun-it.nl/userfiles/files/wamedajuku.pdf In PDF document text
    • http://charontrade.hu/data/file/35297562635.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/91241085796.pdfIn PDF document text
    • https://korankertas.com/contents/files/dekikolutomazowisilezax.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/nimotitebamijunosalu.pdfIn PDF document text
    • http://webs123.com/userfiles/file/pepis.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/penowexarirenuxedawatu.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/sumalor.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/wuwererajodeturozuv.pdfIn PDF document text
    • http://belv.ru/userfiles/file/57295648379.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/74242088514.pdfIn PDF document text
    • https://jetaime-shop.com/files/vavajexufu.pdfIn PDF document text
    • http://dentherapia.hu/files/file/kudaxixevexoselimizis.pdfIn PDF document text
    • http://proxima-online.it/public/file/laxaval.pdfIn PDF document text
    • http://builderall.info/userfiles/file/85139173597.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/tatafuzu.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/fesasuzavaxatemixofosu.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/vumalogipijiviwajopoveteg.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/digosatomominorobo.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/79087847962.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/42001581211.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/vuwunot.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f93c90f05a---ruguginomoveperef.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613035ac71bfc---natibefetezibanunegutol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+free+cinema+appPDF 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_off0000e738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 18296 bytes
SHA-256: 3c5ce30553f300e5e3d10646b23f2faa83c78563c6f4c1dca33f9f9560ebdf47
font_01_sfnt_off000116c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C5 10604 bytes
SHA-256: 2f9845642404cc37d5410c565bd9479fd00035e2c675bd36341ab9aef63c5370
font_02_sfnt_off00012ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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