Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f17800c30d3e58…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 07:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ea0dafcf4fd11fcd01b7a5ac05c5e2c7 SHA-1: b3a2f4502fb83c2191f673df3fe88b880e28b61d SHA-256: e8f17800c30d3e583a95f6df30a9038d899b0e7cc4d75314e75baa2f6ccc5576
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which point to a link farm hosting numerous other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=games+modded+for+android PDF link annotation
    • http://vanillasky-ch.com/images/files/29236316178.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/ludisapekidabegogazag.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/36020679907.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/92447478337.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/38306016906.pdfIn PDF document text
    • https://medtek.vn/storage/file/naxefiwaxedel.pdfIn PDF document text
    • http://someteme.com/archivos/_20210908000948.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/40589833611.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xobiwegonibogimobaxonuso.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-16/20210916190909507431.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/malamevitosekon.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/53350107789.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/18741143818.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/zopetoluxamovovi.pdfIn PDF document text
    • https://krossi.ru/images/content/files/17207046836.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/94298019583.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4c595379785f3d892cc71111efe09bae/42984197850.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/23398963436.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/wafikilijefegevi.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/27619524042.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/16897418618.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/45924859895.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/19267542021.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/bezulunaragakidobekono.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/83878861428.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_off0000d088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD088 19100 bytes
SHA-256: 3f1bda1434a6728f11035dd3b8c2ef69bccf465d7141a96c7f3bedc4e5dfc3f3
font_01_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 10408 bytes
SHA-256: 3f11c1c0189a9f8074dbe3e76b73298c2440dba5ca5ea0e9704a348191cb25fd