Malicious PDF — malware analysis report

Static analysis result for SHA-256 38dab68253e9c674…

MALICIOUS

PDF

69.0 KB Created: 2021-10-03 19:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 63a0bd401d95144ccf908be80adda0e6 SHA-1: ea6ee8bb1563008707d2afe342fa6ce52d5c18a3 SHA-256: 38dab68253e9c67421780eb00aa810c2171bc3510fd4332a2ae45985391fc375
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external, often disposable, domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=the+beanery+hours PDF link annotation
    • http://murito.fr/ckfinder/userfiles/files/81254549295.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/mafedugasodulikul.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/50739705356.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/11462548939.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/57960790126.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/fakojalazudevedizisisoxem.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/tugakikenasamamivuti.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/56886015439.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9dec3e2721a8609f58b5b9540391e0d9/labevisosofimexoruxalazow.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/tufef.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/juzenosijuk.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/85193850656.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/89131138135.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/nifojaxobevoxemiku.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/64947785647.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d8ddc35d6---53204163175.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/jepexosedu.pdfIn PDF document text
    • http://katachizu.com/img/news/files/90458784282.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/narerakarip.pdfIn PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/83496410737.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/54309623476.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091605154973499.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/1365614473.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_off0000ae8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8F 16180 bytes
SHA-256: a6ca44278f45bc9061db13cef537405335c665bc4e45dcc74ec003a5b9eb4ee2
font_01_sfnt_off0000d815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 10284 bytes
SHA-256: f78b7361f0aea304c100961581214b7bed096655dd34f3f6c176331a128fe82e