Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bf65131c56d9d6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-24 06:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 663514d95a84da0966448b7c3a0c400e SHA-1: 5ed1543b03d573d50e22372c41b918fe33e3e37c SHA-256: c8bf65131c56d9d677ef7dec6ee177954cbd2d1ea3324dfc8ad0ac365870f238
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on disposable domains, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://irlanc.ru/uplcv?utm_term=how+do+i+access+my+mobile+bookmarks+in+chrome PDF link annotation
    • http://optimaglobal.net/ckupload/files/57767329762.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16132535a03c3f---77945913636.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/72673156689.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/94272326672.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/26298901046.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/toxetarogovodolevo.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/podixipibifopopi.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/xavuwex.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/96979032385.pdfIn PDF document text
    • http://benrassam.com/uploads/files/9001422483.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/kopezutabe.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/fizuvelaveb.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/jepadujagibizumugogupofir.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/58011938660.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/devenotuzuropogamadadog.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/viwamelewitofiw.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/sisulogugopatosuzupekegil.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5bfb0b744---73531916636.pdfIn PDF document text
    • https://phuquiland.com/upload/files/5228172341.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/xomikanopazigitalar.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210906195757954155821.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/rawikew.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_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 19148 bytes
SHA-256: cb2d260dfd40392b816c621787360b20178932ac8838e4e221cb03b5777b6edf
font_01_sfnt_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 10960 bytes
SHA-256: fc88d82a96ca3e49b2e648de5cef90837443bde058b53f87b8f03f467aca5c3d
font_02_sfnt_off000126b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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