Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26b0282f92105cd…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 05:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2e68c52d57b281d22b8de2d52fe66875 SHA-1: 88471db26d1c6ad9feb2577c61fd6522d4d9964d SHA-256: c26b0282f92105cd59642e58502607fca27de3deb5beea8f0be0d1cbaef3e57e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://korzayithalat.com/spot/admin/fckeditor/userfiles/file/83053207764.pdf In PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210902041916.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/bukevaxil.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/29667016974.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/gezotaxatuwok.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4941c2d0---16028656885.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109041945428833.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/80892364325.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/welozegizumupaz.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/dovilumumutal.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/acf8b9f4a17a7b429dc623ea320bcc81/tipixowoge.pdfIn PDF document text
    • http://thongthien.vn/upload/files/xugefopazojegarivexuzili.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/53881394053.pdfIn PDF document text
    • https://hoongnau.com/upload/files/65111903568.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210913100845.pdfIn PDF document text
    • http://simoncaulkin.com/images/83598879236.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/99811313643.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/29427181123.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/50709935234.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/waxulirudufi.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/vogimevup.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/46192317836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=vidmate+for+pcPDF 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_off0000d312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 16976 bytes
SHA-256: ecc6f68628c80a0e419ee096d29128bdb20ee030ba165eff3f2a6c01d4e6637f
font_02_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 10432 bytes
SHA-256: 2a421c6890a6cc28239b91bad99a9a46b520bc3711e8c74ced31dac23430687b

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