Malicious PDF — malware analysis report

Static analysis result for SHA-256 259ce6ac0819ff13…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 05:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b99cc61c29d31f397e5724e782b02dc4 SHA-1: ff8f334d7c3ae73740a4876cb3271b9e227f5960 SHA-256: 259ce6ac0819ff1333ae5bc9b239005601a987f9a6fd1a230df6de61059a8b1f
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous external links, many pointing to disposable domains, indicating a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF is used to distribute traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://jshanwoo.com/ckfinder/userfiles/files/99190806956.pdf In PDF document text
    • http://j1medical.com/uploaded/file/98533702624.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210906044938.pdfIn PDF document text
    • http://esistore.be/userfiles/file/vikenozunovozazokotibeluz.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/difipusosivozelokak.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/mesovivemapevis.pdfIn PDF document text
    • http://szpk.hu/_user/file/jinadujufesuka.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/makawajofunisebeti.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/wudapuxisanavijemije.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613edeb2c80d5---21617958712.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/29735347490.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/zobigaxadufiwaxud.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/gegofijofefatidofi.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/riwezezevov.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091122313673499.pdfIn PDF document text
    • http://erex.hu/upload/file/jofanewovawov.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210910083133106.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/debururepunapidimusego.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/javupad.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/32831278511.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/49709881237.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/vibijeniwopikejepeza.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/70041818075.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/5973026051.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/26d735e49dd7b538652f445f5067caf9/80792182541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=nursing+administration+textbook+pdfPDF 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_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 16320 bytes
SHA-256: 6e7039ae88a25a042c367875db72c39d3bcd9590129eccb6cd3f745393e8ce70
font_02_sfnt_off000119c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 11208 bytes
SHA-256: 094a91d7d053019874ef111d2bb5ed0d1e230e3f9a357775329b473326282059

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