Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cfd9abc0c083f5…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 04:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 461616693984a7b4d989d0c5f89169cf SHA-1: a58e5c7ab48fc434e02ae7c6a9d66f96cdbc60ae SHA-256: 45cfd9abc0c083f5d350d3b59df3b44132d79006dec1d00fd3e254d16bf4dabb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to 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 exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=games+like+hoi4+for+android PDF link annotation
    • https://coop-alternatives.fr/images/images/zupaxusizedazenol.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/vuninemeg.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/92210930197.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161436355c595c---vuxiwunazitodoleget.pdfIn PDF document text
    • http://youil.org/userData/board/file/20907067952.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/lisejopepi.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210901052212.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/noxalujorabiti.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/vozozufub.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/tulibitadigebul.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/79533814899.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/fabaliperigoxetedokuv.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090415544724.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/sujevogavuxozepu.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/bewolimezoviwibitu.pdfIn PDF document text
    • https://goodline.by/userfiles/file/dorukudi.pdfIn PDF document text
    • http://homeopathyhk.com/files/1217975845.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/34553650256.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c42680b6504613403f083c731dbebf0/polowej.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/zegunopilefasikikukujon.pdfIn PDF document text
    • http://chinalabware.net/d/files/rovemopejonewizedaxitu.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/nawalivolepefulowugob.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/lalososove.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_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 10728 bytes
SHA-256: f3c4e792c65e80118631070214aad56a9748de03427a3da4e3cfb77d2c4997b3
font_02_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 17252 bytes
SHA-256: fe4c65cf168f7ae96c8c9a0086e7c70b816c4219c9d6f3ac4a3d0eebf0d8976a

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