Malicious PDF — malware analysis report

Static analysis result for SHA-256 43df4fb87af6c582…

MALICIOUS

PDF

89.0 KB Created: 2021-09-21 01:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 501eacee8c4212309a365ac1257faaac SHA-1: 4866ea6aec9fc0d484f7c5c35cfcc7c96c11fc05 SHA-256: 43df4fb87af6c582a306311b35dd97ae165e3e2240ce1b1924ba0d84adf4aaf4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=how+to+hide+apps+in+redmi+9 PDF link annotation
    • http://jamalcar.com/userfiles/file/sovupixibigovagi.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/38816452830.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/kogivabib.pdfIn PDF document text
    • https://derfo.info/resimler/files/88846989916.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/rugebakuxupiretonuturi.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/gemetemaramuvasekidisam.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/71587107956.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210907_E3D92084276AC481.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/64c08c8c6a15a1246bd8ba5f689523ab/33765309393.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/rufugotogarosoxelarufifa.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/supedazomonuv.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/79137612712.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/gaboja.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/79732921122.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/76588550962.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210901191352431872op3356.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091322224880554.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907221514433020.pdfIn PDF document text
    • https://baglab.pl/galeria/file/zigixiro.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/4045544091.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f0552f889---28841089585.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/kenipetojivetafosanalorap.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/82485895141.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/69747991337.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/8407818721.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_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 10856 bytes
SHA-256: f747873584b90bce8df6903011c4112b3e25d7ed8b6bc23d17bdfdec988e5b94
font_02_sfnt_off000124bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BB 19020 bytes
SHA-256: c7c554d610020fecef0ac3ae747455d659f2ff4e2fa20e478581b5bf5d7ebab5