Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc8f0b49bb4657b…

MALICIOUS

PDF

90.0 KB Created: 2021-10-08 01:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3b978c4c6a5723ac40afdb3d681d41a1 SHA-1: ce9749ba133f61e4b11e6f9f32e2bb05d2e86c4b SHA-256: 5dc8f0b49bb4657ba426a0684fb6d17f18b9839b565583771fa2e68e2acc60bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to link farms, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://wildarium.com/ckfinder/userfiles/files/fatazilijadagezegake.pdf In PDF document text
    • http://sirindhorn.net/upload/File/kokunetajagulibozusubikag.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/vupewowoluwilinitirof.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/jomigagadimupow.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/12893778532.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/tevenopejazomuwedadudos.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/kasetezabe.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/legadosipomexefikedejodef.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e8646a7a8df8dad90a9076f51613d2ee/87564168032.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/jaditibuzotozozo.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/fuxanijusurigofubenixe.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210923_2415B15180046E4D.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210918/file/16319713968866.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/rifesamuruxuwumabazonab.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/tewagakewepovububezanav.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/567864d1c7dded8b47b1a546df4e8eef/pidinipo.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/10490346318.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/vegowekojowu.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/budawekozapin.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/44502586460.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xujamisejigapezizase.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/sibedofexerib.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/tuxazogajufo.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/26655091985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=brad+pitt+and+harrison+fordPDF 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_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 10472 bytes
SHA-256: 1aaaa632d090b64a05afd436878e8c10957fb03f973f101235813a242cbbd3e2
font_02_sfnt_off00012666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12666 19840 bytes
SHA-256: eae7296fa68e791cfa7475193c1cd227905ed6d352008f49d79a8fef4814a15f