Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd53f485065d3041…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 23:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fbc3edee699ee8d6a860a9939229261e SHA-1: 275c840d49ed73a765bd6f06c8dd2eca7e107a6f SHA-256: bd53f485065d3041925831d631f5c769c52d55d3ea2c3c016dd97e36a53363d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links, likely for phishing or malware distribution. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=android+not+sending+messages PDF link annotation
    • http://fuyu.010bi.com/ckfinder/userfiles/files/99164926461.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f259159afed006757208e3844d5ca5fc/46579422672.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/sodeluzevi.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/25404630102.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/laxepalav.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210901180834.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/36035570659.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/pisaxufowopamujige.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/19938991900.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210909033401.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/lakuxeguv.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/91225475348.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/89860585839.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/xoperuxixasutisu.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/duxiwipumunulu.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/809fff04f44631995699bbc926258d72/48756902063.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/27918768127.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/364283029.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/zatewobakewomonovokujav.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/jibufo.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/deridivuwawe.pdfIn PDF document text
    • http://xsjprinter.com/d/files/jodix.pdfIn PDF document text
    • http://harlit.com/upfiles/file/68136097500In 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_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 10528 bytes
SHA-256: 0bf133b3142c4154ddd83469dfc5451bd02c0f1e533c4a209d3f6733f73338bb
font_02_sfnt_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 17788 bytes
SHA-256: a1e7e194f99a92b8cbc2a67b728bc67c75168a9d92404fbe7b62072e601948d9

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