Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3dc75ff8d667f4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 03:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31f56ff73b097ce3ffee6553dc259f27 SHA-1: 638944bbd08dc67e98335da803e48f9f19e8ea7f SHA-256: 8e3dc75ff8d667f416ff29f5df0ffef5d05f629f66d877f3d3faaeb90edc7312
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious PDF files, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://vandolderskb.com/images/usr/tubiwedezetitak.pdf In PDF document text
    • http://houstontca.org/Content/uploads/files/gokepozedadosokesu.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/damaduvekewewim.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/megurozerisemox.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/figezad.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/91165316238.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/8731619103.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/27275933218.pdfIn PDF document text
    • http://ilkemymm.com/image/files/taruwozasifajel.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16133e5bd9fbe8---newuxefageronufad.pdfIn PDF document text
    • http://videocycling.info/files/file/venijafofojoni.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/lugodenidosebosi.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56079987300.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210914024738.pdfIn PDF document text
    • http://partnercable.hu/files/66472801356.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/82381251655.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/1860517760.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/88530424426.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/22515334652.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///poxugesujavuf.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/fofuwufasapulapofetoruj.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/52363943783.pdfIn PDF document text
    • https://susta.vn/userfiles/file/19295209444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+euro+truck+driver+2018PDF 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_off0000d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 18256 bytes
SHA-256: 6c3a2ab5ab52c8e22075453c7bbe6a730ec1fc782ac579f8d855f83c00d78f2a
font_01_sfnt_off000104e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E9 11040 bytes
SHA-256: d3df98b57e6d068d2c61c928c453f7311ad2e7534c89efa19de2c9c8bea5c4a4
font_02_sfnt_off00011ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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