Malicious PDF — malware analysis report

Static analysis result for SHA-256 686f83009c75dc8c…

MALICIOUS

PDF

68.9 KB Created: 2021-10-03 00:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 083e26a7cc2360a00da6a957fe207d10 SHA-1: 50848278a2919eefd0321043b59dceadf32cade7 SHA-256: 686f83009c75dc8cbe5df1dfdf489ee8c5cd34f5f818e003e3e934334e1441e3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://allytemp.ru/uplcv?utm_term=physical+features+of+animals PDF link annotation
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/wudarokadape.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/78206948288.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210902060859.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/66049754034.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/7154458278.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/morigegisiw.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/14710491832.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/622331850.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/tuvifokukogezifutiviret.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/48466007848.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/69135205615.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/88528983306.pdfIn PDF document text
    • http://wixoon.hu/upload/file/gakibuwarorezewozobuji.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614566108390f---93601583658.pdfIn PDF document text
    • https://gdaniec.com/upload/files/tegobudatusit.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/31794351205.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/24939733155.pdfIn PDF document text
    • https://www.colegiumaniucarei.ro/ckfinder/userfiles/files/18389165611.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/fetiwozomemutegurixu.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/pujujow.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/77314033213.pdfIn PDF document text
    • 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_off0000ad00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC512 15980 bytes
SHA-256: 967b03a0483af4ceca1aaaf36ee86fd114229785414b896a75218148edcdcd7a
font_02_sfnt_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 10816 bytes
SHA-256: 44f8752df19761e2bf96e8fb2c6935fab908afda224fa2c8bbfdc919c59abec9

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