Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad0c05c76a41bbb…

MALICIOUS

PDF

85.0 KB Created: 2021-09-11 07:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03bc3181c8021fcec66af2074a63809d SHA-1: 37df45f40b14590974c5ffe5cb8d2c8f82fc7bbe SHA-256: 2ad0c05c76a41bbb43c93de5519b5c1323733f4aaf424372e6f6644936629036
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to distribute malware or conduct phishing. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection signatures point towards a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=hitman+apk+free+download PDF link annotation
    • http://bantinnhadat.com/users/files/kupanelovigik.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/rulawuridixamibukagaw.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/94364755473.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/losazezamafupawipomafatak.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109061157089267.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/mefavusawunaboxilara.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090722563373499.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/12627764902.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/33722480914.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/5932453801.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/xilun.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/vanoj.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/26922226343.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/27758885168.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/lazanupomemixad.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/35588653504.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/gegaji.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/17628510982.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613056f2ecef1---lewuwepuzimugugipojasibos.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/27837325361.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/vupoval.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/xemizovapufedorarir.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c469b9646---34051588262.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/79624553527.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_off0000e5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0B 10660 bytes
SHA-256: 79bb09f64ee33789c5d820a140b19ebc60d3e58c6f00ecbfea1577d9e809839e
font_02_sfnt_off00011665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 18396 bytes
SHA-256: 181139fb671863611633f9cfbd428a3daaf5732b9ed197e7a7c4383f608bebd3