Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffd1cddea3b1d3a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 23:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75e9c43ae0df8c8dd68c0c0e28e518a1 SHA-1: f18184f63fa3518a3399fafea78bd49aaa240cc4 SHA-256: 9ffd1cddea3b1d3a3183b4fcab3bb3eaa309a503a285812dca458d75503d71b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external, potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the PDF's structure as a link farm on disposable hosting, suggesting an attempt to distribute malware or conduct phishing attacks. While no scripts were explicitly extracted, the PDF structure itself facilitates redirection to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://smidgel.ru/uplcv?utm_term=convert+aac+to+mp4+online PDF link annotation
    • https://umutisi.com/umut/upload/files/nibawa.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dddf9b2e4---27654341486.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/jajukak.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/varegotenudifo.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/puwatope.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/lilobifazinumofewuto.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/86044456284.pdfIn PDF document text
    • http://strandedtattoo.com/file/vadolizuwabem.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/legovofatukizemigusewisu.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/kajobexar.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/10998589655.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/66491155947.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/xirof.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/zatunodeweja.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/dufedotapeziregizizobo.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/vozukepagawirokofaxamo.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/xisemeguvigewuzofawixi.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/vaxitud.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/lopap.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/sugekogiwaturazos.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/84884291095.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/dasavasifuxejezuv.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/tuberagado.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/24156739323.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/65374402382.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/6872412547.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_off0000d3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B4 10544 bytes
SHA-256: 6c84de9ddba94693c5cd1a96dc0ede53335f37485315ff94e9954fe083717016
font_01_sfnt_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 17324 bytes
SHA-256: 4ecd4a2b491ee99327aa19b1d8e742d9dd30e51f0dcd6dec138ab1fed0e567c4