Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c10389e3e9eb62…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 12:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3ca7246d32166e0629a6ba636bc2a0c SHA-1: 1883b79fb0457580d21ab36f930dccf89ab7d00d SHA-256: 75c10389e3e9eb6264e3d95ebf1d58068deeaa389512cc570dca04ca3236ceb4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting a phishing or malware distribution scheme.

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://archism.ru/uplcv?utm_term=is+there+a+screen+time+app+for+android PDF link annotation
    • https://renault-service.com/userfiles/rapotisofixif.pdfIn PDF document text
    • http://cl-pub.com/files/files/44583138081.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/96424455536.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/kojowuxitaxowoxaxere.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/tawin.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/80901125776.pdfIn PDF document text
    • http://jawarakreasi.com/file/katebogopediwokutaroxekes.pdfIn PDF document text
    • https://phm.vn/upload/files/26503626238.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/padidedatipewubanelamep.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/wojojikifojoviba.pdfIn PDF document text
    • https://birudongker.com/contents/files/feruzapixakewexifas.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/wibititefasikudekupuzatu.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/58701534370.pdfIn PDF document text
    • http://agavietnam.com/img/files/28685902156.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210910111040.pdfIn PDF document text
    • https://sharenkon.com/files/wanuba.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/fiwedo.pdfIn PDF document text
    • https://luminex.pl/upload/file/jasizilemuw.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/rerezameles.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/topewogimukuxobu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613c151bd6f95---bibup.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/78803350749.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/40031192001.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/munim.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_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 18272 bytes
SHA-256: c331cf752bd07346d353ea152b6bc5c020d75af54e5254d57dc573fb0ebc128e
font_01_sfnt_off00010b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001237d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237D 10788 bytes
SHA-256: faa6788f856e3486d6f5bb227481621740ede638bd6c74e54ff18b22ae03716d

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