Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eeec3c98cdc0fcf…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 07:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b0c9f29002a02538578093e6a59bdf81 SHA-1: e033ea1f59b1eec2d3d794a59ae7b1be2f3fd020 SHA-256: 6eeec3c98cdc0fcf6717ce0b161b7567a4afe6da5e0f857b8093f657513c85d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous distinct hosts, likely to obscure malicious activity. The embedded URLs, such as http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7d7bab124---50405636215.pdf, are the primary indicators of this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7d7bab124---50405636215.pdf In PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vdhemgnv3ik5ek4meqpcblme52/bekigezazowezixirotofelez.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/45732914521.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/bupukeratutareborugef.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/95762011315.pdfIn PDF document text
    • https://chp-travel.ir/data/file/tefefi.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/tinebijamiriwoxokal.pdfIn PDF document text
    • http://7profi.net/userfiles/file/zojigevigizivelipod.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/seladeworabut.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/titogulizukulituzomo.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/towuk.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/wubofososubasomis.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144205e4ce7f---89152230465.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210918_0F49E7B46EB6F0E4.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/32287342150.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/33591356920.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109222132254980.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/zubedanes.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/8605934182.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/parupadu.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/wowuvetudu.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/jamewazi.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/88126372780.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/ruxefoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=c%C3%A1c+game+nh%E1%BA%ADp+vai+offline+hay+cho+androidPDF 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_off0000b348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB348 16868 bytes
SHA-256: 9fa2f9f5405d9bca8e6d00b9f82a4bd080e488796f26da9b4cf9f1118e16000f
font_01_sfnt_off0000dd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 11424 bytes
SHA-256: f14a59f13ccd1cd34e2e1db3d7226522feb1b698ad8ed2b0b35de5e02ef8b2ed
font_02_sfnt_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1