Malicious PDF — malware analysis report

Static analysis result for SHA-256 6883eabcffbdb0e8…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 00:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5ca541bceced1a7fd5f64de7a48f585f SHA-1: c80d82605fb9882b3bc947f0bb0873cb43d2469f SHA-256: 6883eabcffbdb0e8b18d05d60cb87a5eb9c403e75f3ae13ee55d06bdca119f42
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. 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. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161395ac9ee521---dowoxokafilarisituji.pdf In PDF document text
    • https://sakkestadbil.no/userfiles/file/pomamane.pdfIn PDF document text
    • https://uudanbury.life/files/file/88934596717.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/34048592766.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/babifomonulunafuliji.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/jonigogikefaxikekurelire.pdfIn PDF document text
    • http://signauction.net/userfiles/file/lagutomokabiluvefako.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/wufisekukelut.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/fadovetukudorase.pdfIn PDF document text
    • http://egitara.com/upfiles/files/wuzebufilorat.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/podaguri.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/14156782973.pdfIn PDF document text
    • https://menu2uplus.com/images/file/vesibelemolivobukofow.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/jazoxujitilebogorifol.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e7ab26296b6bd8c2c1c66cdb8f578b54/fujaw.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/bomepof.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/71476288679.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/sibaduduxore.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/nozevosixuvugozerowob.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/mugisoxivikowowanasivobos.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/641601326.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///vuruvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=call+of+heroes+androidPDF link annotation
    • 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_off0000ad10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD10 10384 bytes
SHA-256: 793d72d73e5c821dace9da4cf4c9c914aa4c47775413fcb7ced47bba8b47dae0
font_01_sfnt_off0000c472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 15628 bytes
SHA-256: 67f719fbd13bcc5e885a6feef631ac985e77f4bc4efb853b18f22aa2b6ac35a7

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