Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2fc338a39e2121…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 14:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e6015e5a7a4134c5faa4ba3d240fb55d SHA-1: 489b40b914eeb9d0f612e8eb558e57db69485c70 SHA-256: ff2fc338a39e212109b23550a3db6878acc437d9ebb024574c82e748e6dbe910
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, a common technique for delivering malicious content. It also exhibits characteristics of a link farm, with a high number of external URIs pointing to various domains, many of which are likely disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://aceonlinementors.com/userfiles/file/polojelatajaregorivu.pdf In PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/16228344264.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/zelopira.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/viwej.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/banomebudukewus.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/mozigutolowunexunapeluzu.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/30029190080.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/44688683267.pdfIn PDF document text
    • http://kasargod.net/uploads/file/rezika.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021911546183750.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/ronobuxumivel.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/relugavobuli.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613580d7afff8---45835387564.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/sorezatorinulonor.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210918/0523034574.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/ximilobulavukojaximixoki.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/19192407222.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/57902250157.pdfIn PDF document text
    • http://rentaruedas.com/files/others/gowususuzevenaxogiguwi.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/kipokomatu.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/87022294991.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/97544764690.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/bakokaxowo.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/67630907471.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/56913375681.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/96505191376.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/nojinigotavejevezevasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fast+and+furious+9+full+movie+bg+subPDF 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_off0000d667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 11148 bytes
SHA-256: 18213807513d20ae4ddc711a0d87677d59613727461b87e5dcfff1e6bf4facba
font_02_sfnt_off0001085b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 20116 bytes
SHA-256: 8be77ed8721727cb530dd8896854e8701761919613466ef4c8c06911cc6fcf11