Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6c4c799ea6b6f8…

MALICIOUS

PDF

101.5 KB Created: 2021-09-17 03:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 61ea49eca63e679260a4e8f80b26cb96 SHA-1: b8d6e1a778deb00bf0dd153f18b7fcd8f6a763cb SHA-256: bd6c4c799ea6b6f804bd358dd88023619a43ce8dcf7e4ec551707175677f90a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://garglob.ru/uplcv?utm_term=boruto+episode+51+english+dub PDF link annotation
    • http://moiarchitekci.pl/pliki/file/18569773809.pdfIn PDF document text
    • https://suncables.co/images/file/71916314914.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/75478587257.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/luzujewujujufirolodavux.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/virulerazizalekigasawod.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab04613b45---64417159501.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021911918328315.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/gijorolemisazivegavidaxun.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/61419db21ef24.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202195918293077.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/99541566658.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/lamepizabedowogiworazaju.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/49836208820.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/31563627892.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/66402973037.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/81424143791.pdfIn PDF document text
    • http://sivam.pl/files/file/porogot.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/sudebekixakopixuf.pdfIn PDF document text
    • http://synergyproperty.com/images/files/jabiparafukazi.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/37978114402.pdfIn PDF document text
    • http://glassick.com/userfiles/file/kitulobare.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/94031080702.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/87892574842.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/bepoxaripizabixefesoto.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/xobog.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210910014441_63kjx5.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_off00012935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12935 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001414c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414C 10988 bytes
SHA-256: 7b1dde401385b05723eb36b5cb0305f9e140edcfc257b9fa73cbaea3b67439cf
font_02_sfnt_off00015a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A60 17656 bytes
SHA-256: e1dd729d42aa9918c557f89ad993fec1d5a948bba5e70f7c2093715619c605f6