Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe34ce6b9134499…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 12:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 510149b2e2a69203033e606a44ee0ac7 SHA-1: 8d2df5469941edfd2ee7747323b26dc969b04f8d SHA-256: 5fe34ce6b9134499d9af69f7d16c86cb822d70d0fe132fa8c4df3e0fab6dca39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing campaigns. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://jv-cms.crazy-jessie.nl/uploads/files/10301304574.pdf In PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631589579_ce265fe047.pdfIn PDF document text
    • http://standardamulet.com/files/files/valofuxexegoxibitofaso.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/82502256561.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/26847527840.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/gujizotadumamefiwegoli.pdfIn PDF document text
    • https://membermimpi.com/contents/files/fepowe.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343888409a7---dajujagujoxu.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-2/20210902104943823875.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/49771868291.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/54ce6c667129f7f748d06e3551790f14/tufezal.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/gujuvetav.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/xotusafijinakuwukeduv.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/39078245712.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210912042051.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/lopisoxoroz.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/fetuzuxuwekawisedusiwu.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/tuguragusomufoba.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/57111874220.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/xerorasivusekawurixukoted.pdfIn PDF document text
    • https://digireg.lu/upload/nugifopiguwodavoxal.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/42944501534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cite+website+apa+7th+editionPDF 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_off0000d949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD949 17748 bytes
SHA-256: 9092d8e3bea1ba7aa230a13db45f02863999edbec6eb4ad281d2b1b2a374a057
font_01_sfnt_off00010733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4A 10652 bytes
SHA-256: 13d575559d996655452cc506e1a1276c7afcbd15ebb57bb9feb38fbed0154c67

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