Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c18bce0426d5ad3…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 11:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 334edd126f41d5a1a972368a9ced67a3 SHA-1: 2e715d3349719b33e36cd57796d020fad1ab7a07 SHA-256: 7c18bce0426d5ad3cb682d86aea8aa729f79bfd7b70484ba250be04e57479b86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malicious content. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a high volume of links on potentially untrusted hosting. No scripts were extracted, but the overall structure and heuristics strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.laterveer-biesenbeek.nl/ckfinder/userfiles/files/70329057768.pdf In PDF document text
    • http://zjbfjt.com/upload/files/33103195603.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/rokawumol.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/vavira.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090800001128.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/milel.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/negapamusosikef.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/betixebutavusevogemoxerel.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d05a02259b---38131230632.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/vaveloz.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/91594219085.pdfIn PDF document text
    • https://shunnasato.com/35449694828.pdfIn PDF document text
    • http://koddous.com/userfiles/file/xupidubilid.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/1069019650.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/33266870860.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/60059162279.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/75736148155.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/30671890342.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210908_2DBB75C34B3FF3E2.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52815402442.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/1006619266.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/43623399102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=back+mechanic+pdf+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_off0000d9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AF 17368 bytes
SHA-256: 3b98619b5fc2078a13a2711eb129962373a16bbce2cc673ada1d8aeade6f3b20
font_01_sfnt_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 10748 bytes
SHA-256: deebea8aaa0f27f881fcee22b96ec79165efc3a87bcdc5d82e8353f90cb7157e
font_02_sfnt_off00011e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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