Malicious PDF — malware analysis report

Static analysis result for SHA-256 d128033a8d9e9d31…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 04:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f16925a12c55a35426c7d41ebed26b83 SHA-1: 74d517ca94e6e659e04fb9eb2daa4bc909e77bb0 SHA-256: d128033a8d9e9d31ceb71cbd36ee0f7ee61e93f345d6bdaa61d9712e68614122
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://queure.ru/uplcv?utm_term=psiphon+301+apk PDF link annotation
    • http://wohingltd.com/userfiles/85756062475.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/govoxurojofirowegilisajo.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/85276895820.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614081f938891---nowowozepe.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/latedapa.pdfIn PDF document text
    • http://tion.hu/upload/file/merekodop.pdfIn PDF document text
    • http://talleresjpg.es/img/file/mobokuligul.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/lemefilag.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613238c448149---24004218149.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/matisezagifizokun.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/zaren.pdfIn PDF document text
    • http://hybsch.it/upload/file/22525611842.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/fovuma.pdfIn PDF document text
    • https://securitydm.net/slicice/file/lekapanimozatuxorifa.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/40533289279.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/kinax.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/tiboku.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vadavipajubobupixo.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/9224946386.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/98675959907.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/77349410861.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/kalodenedupizamaposoku.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/xasibuzeranoxi.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_off0000c9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D9 17336 bytes
SHA-256: 08effdc3bce1051fc30b62362f5d9d1338e1276f234283a2673fdc1f6e659f5c
font_01_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 10412 bytes
SHA-256: 8b44d1f354306b0b49094f15298e8b81d120ab566924adaa880332e9d0815809
font_02_sfnt_off00010def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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