Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4710f4bfdd4919…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 02:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 69fb762e669fa1e94af2ff6b7d1671ab SHA-1: fb5dc50d49d904e8c79c74dfd459ed48a2efc973 SHA-256: 6c4710f4bfdd49194c8506a4225e970bfa34c8522fea4152145d876c9e3a4e0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains and are presented as document converters, a common lure for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://progettogeometra.it/userfiles/files/sirurujinoxarebeleroloxo.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613db76b37a5a---futudenonemumeri.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/pusakavivemotaxizijenuj.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613928d7426a5---65560719111.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/63639160659.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/joboki.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/25876829078.pdfIn PDF document text
    • http://acril.ru/ufiles/files/54915687334.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/69397442786.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/davoka.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/12643755887.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/kazexusiteso.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/gulolesu.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/doleloxolige.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/47137945383.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/59389410349.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/9701156039.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/54252082787.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zukapiwonikopajozimova.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/purojagevejulopo.pdfIn PDF document text
    • http://coolscape.info/images/files/25329780057.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/lidokagatozilimufojuz.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/sewupuselofikobaravom.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/rexom.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be11f4daed---fapewuvawukepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+to+doc+converter+online+free+editablePDF 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_off0000d788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 10508 bytes
SHA-256: 51447de17c4b6a338582f142329f066458cff223eda4c17cac6c142edecea428
font_01_sfnt_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 17600 bytes
SHA-256: 70830804e64c9558651e3b251d7b93baa439fe2c1e6de4ad3eb3e5843936b29e