Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca352b2b17cc06b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 12:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09328a3023eb93d462552d6733b14a5e SHA-1: d81538e59755a16d9739e3b0dfb99df7b7e181f1 SHA-256: 9ca352b2b17cc06bebd0ac256f0461eb0a5b5133386936cc96d4147651bd05cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to unknown domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://joinvita.com/neu/userfiles/file/63920944117.pdf In PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/70270010874.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/zowuna.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/nibimatototebuzuwemud.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9161e03f---tisotuxefimuwuvodas.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/norapevat.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/29438751522.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/mivaxuveg.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b9b45e77c---bixunetepadevox.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/sigixukinumeseza.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/xerorasivusekawurixukoted.pdfIn PDF document text
    • http://poiskvod.ru/images/file/xaxipefegap.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/74983409552.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/nurejibonopegoxodexijaza.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/newifelidoboradofu.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210909070227467598.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/bawetozomutulifova.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/176987356.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/xiveroditexoxatuxaxiwiko.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210905183301.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/zuluvat.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/28512630018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+switch+off+mobile+without+power+buttonPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/gexojiwukepefexew.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_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 10900 bytes
SHA-256: 9db02a9ae6e37e532276d9296d059d13f6a039af4aa0631bc85d160e613314b3
font_02_sfnt_off00010b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B28 18176 bytes
SHA-256: 4d90c60e136ab03e67bc8a3fcf1bcc2a2d3255fb2bdea5a3b557af0fbf61f094

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