Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6e1b3f46436ccc…

MALICIOUS

PDF

84.6 KB Created: 2021-09-14 00:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 864464fbcd872191250ce49a3b64b744 SHA-1: 56ce24b9f0b7982c874cea4c6a6a2a9ffa97c788 SHA-256: 5c6e1b3f46436ccc045ae456cb6d44e5a710471504245a1f2d815bf024352b42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/cd6vjde0omh6b8f9rf6ba6j7p0/64798603983.pdf In PDF document text
    • https://fotojursa.cz/userfiles/file/1163964069.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/66796060709.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/judewofunubul.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/jefivik.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210905_095710.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/meminoramuxav.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/66927350689.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/mefunaposunilew.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/pejuj.pdfIn PDF document text
    • https://limadelimon.com/images/file/jesubiwivajuledi.pdfIn PDF document text
    • https://trexanh.net/upload/files/lidukuxamafedepuw.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/92032555014.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/tilepenupoboxitabujuleg.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/73458383333.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/pogosi.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/mojafatipesadefuredet.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c06983efd2---89815771916.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210903_A9E7FD10A8D23978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mobile+legends+bang+bang+doPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/wovoxujawezu.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_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 17724 bytes
SHA-256: 3970665cd5a0b82769c4e1064777908865f4692e09daad964215635f694b983a
font_01_sfnt_off000115c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C9 10356 bytes
SHA-256: 6e46931ec550c19fc6babae2c80786a936d5a0916bc7cfe1cbc3fae952d2857d
font_02_sfnt_off00012d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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