Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd8b4f04faa2ece…

MALICIOUS

PDF

75.9 KB Created: 2021-09-13 18:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e7a3e7f7691e2f33e790a3bce3ead8af SHA-1: f3bf8d091f8764d4dc13ae71ccd8f245a49f4789 SHA-256: 7bd8b4f04faa2ece8dc389d42e5201cbe09f7479b2b71bac3aa994ace9c242a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing unwanted software. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

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 http://www.synagoge-stommeln.de/ckfinder/userfiles/files/xubusowazifuzibivegov.pdf In PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/musakejufibinitakizosoji.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-08/02a853f731f4eee282c5ed9c03aa4df6.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/89114612942.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/81948238495.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/tipopanaduk.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/buzotuzafojosadovi.pdfIn PDF document text
    • http://c-amc.com/upload/files/koded.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/5116368910.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/89145701776.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109071504283821.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/zutokaliji.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/32647627108.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210913072402.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/kutaritedezifobefov.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/fanajeragezik.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109130836078090.pdfIn PDF document text
    • https://estoniapools.com/contents/files/gulugikuzute.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/26765836861.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/62918548397.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/34701667415.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c9822816d---kodesi.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/2704906317.pdfIn PDF document text
    • http://emannsltd.com/userfiles/20861471609.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613959ae39c84---69231264557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mobile+legends+free+diamonds+apk+downloadPDF 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_off0000c2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 11052 bytes
SHA-256: 7edeb23569fe91aa3dacb504547703b56709b9c2264cdcd69ad4a19554e1712e
font_02_sfnt_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 17376 bytes
SHA-256: 30275f9f8bd73bcf30cb9fc806b4c3b9427c459905df44a734d0080b18c0769b