Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed04ab1e5295c74…

MALICIOUS

PDF

70.2 KB Created: 2021-09-19 01:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b15db7e833b88647f1b81f0c599c68f SHA-1: fcb0d59e122afc20a481610fc0ffb6ccceb6218e SHA-256: bed04ab1e5295c745b342037b7cec097b1d01867f59a98c4f222b024c0e08935
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external PDF files, indicating a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests these links are used for malicious purposes, likely to distribute phishing content or download further malware. No scripts were extracted, but the presence of multiple external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://a2itsolutions.com/chop/multimedia/userfiles/file/verafemulora.pdf In PDF document text
    • http://www.520amis.com/upload/files/78682955770.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/mixejojufan.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/68049451436.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/41298177761.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613bafb3a93d3---96195121686.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210913_11FBEA712439E14E.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/vodef.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/vokilowumuwufofibukudop.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/14945127798.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/86054464180.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/26553972701.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/36960066776.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/84370808042.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb615e332---genuz.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/62288015816.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/46213204946.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/87341285380.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/todejukil.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/48484517790.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/soloruto.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/18683532314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=kabul+express+full+movie+download+mp4moviezPDF 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_off0000b301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB301 15100 bytes
SHA-256: 326824976947b8e6987fe4080048528bf381811fd11f63fae17ba522cd5fb2c4
font_01_sfnt_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 11184 bytes
SHA-256: 6a9d305225a403c2f7b60a8af0ea6ec4800df645d91ef9542fb703cdbfae90b8
font_02_sfnt_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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