Malicious PDF — malware analysis report

Static analysis result for SHA-256 330c9edd34d1a7c3…

MALICIOUS

PDF

81.3 KB Created: 2021-10-19 17:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3b0aacb3776fb67c3c89be5c8840d13d SHA-1: 46718bfc6ee649144b3528a27cea8cceaf1652d7 SHA-256: 330c9edd34d1a7c37758f34feeb430d274b89fa426ee5c1c401f9574873d7353
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wowbond.com/upload/Fckeditor/file/wegewesewikazasir.pdf In PDF document text
    • http://pcwenhua.com/uploadimg/file/163309611697610079.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/rigosokojuvumaj.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/50655214098.pdfIn PDF document text
    • http://adm.stikom-db.ac.id/js/uploads/files/18127363569.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/ronisoxope.pdfIn PDF document text
    • https://bor-diing.com/upload/files/81667591890.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/99810412993.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/16916446496.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/kimemerumufuginal.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/zuzizefafo.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614484745bb4b---89574230138.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/gunuliwoxa.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adaf0c5cc0---80054455965.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/buwurakilizumefawo.pdfIn PDF document text
    • http://ezicms.antifftech.com/uploadfile/file///2021092902515940.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/13360316925.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/fowato.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/14333205225.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/jebovipigimisikokusutun.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/46117795502.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/dafekiriluwajof.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/tixololifipunituxaxekugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/5bhJmFgkeCE/uplcv?utm_term=sm+bus+controller+driver+windows+7+64+bit+lenovoPDF 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_off0000d62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62D 11132 bytes
SHA-256: da3c41dabb94c1052cbdd303be700d764fe742ed2610a771746008aa4a0c2cac
font_01_sfnt_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 18548 bytes
SHA-256: 09f6eaef576a2bd6dd6533adcd14fdd682ac8dc01acb43bf08bb46dc18ba1290
font_02_sfnt_off00011f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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