Malicious PDF — malware analysis report

Static analysis result for SHA-256 5309ee0e1b4baa86…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 17:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4de7e51bfba8cd2a5be6eb10eb197122 SHA-1: 492c8a17c1356afe6ed85140790b1476344a252e SHA-256: 5309ee0e1b4baa8649b2d42de209eceac7e6c968fbe87aa693dc69aff7c47cd1
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, indicating a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the URLs are used for SEO manipulation or to distribute further malicious content. The primary attack pattern involves directing users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nissanotogovap.com/uploads/images/files/marewunefokojafu.pdf In PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/ferepusadepide.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210916072319101.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/68545489819.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/gexudimujejepuvasup.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/n7n8i43vcsmba5ou9i5rtl8m1t/mirabeka.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/bijoga.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d94c71fcc---setedab.pdfIn PDF document text
    • http://tdbm.vn/upload/files/77448817284.pdfIn PDF document text
    • http://favourtec.com/attachment/file/pixirelel.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wizapimonepegifexiku.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109062153331098.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/rolanasoxonipan.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/vuzosepunixipewuzamadev.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/pipimodakuvadojemawowuz.pdfIn PDF document text
    • https://securitydm.com/slicice/file/89431210721.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/nojowokawojuwake.pdfIn PDF document text
    • http://synfarm.com/upload/files/51956178558.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/70374689269.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/2912099000.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/76344565225.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210913_C4C74EB22DAE4F50.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=speaking+for+ielts+collins+audioPDF 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_off0000c8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BD 19040 bytes
SHA-256: 130cdf98098b84052fd303246c5a5f984e8069efaf21f4bf0911114a11945a8a
font_01_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 11060 bytes
SHA-256: 7d301e1a40951657d809b4a3b511181b4954aa3a00e339345d24b2df2d04ce49

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