Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb703e7236e2387…

MALICIOUS

PDF

67.6 KB Created: 2021-09-28 07:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9bea86edfa00d4ce3a0764fbbc7aff9d SHA-1: 898373c699ebec4920dc1be438cc3ce11474dac6 SHA-256: 2eb703e7236e2387744e5ae97dfcaf5e1524ca4d98af40dd54ede7fed868bd12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs that point to disposable hosting and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://krisoc.ru/uplcv?utm_term=exploration+craft+old+version PDF link annotation
    • http://urgentcarepb.net/userfiles/file/worizuxafokiriloxumud.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/zizekaleloturosifowukosa.pdfIn PDF document text
    • https://alariel.be/userfiles/file/98004921277.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/gurojakigolix.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/zunixuvowupex.pdfIn PDF document text
    • http://ombs.ru/uploads/files/44883423755.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109121626242419.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/bobuzit.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/dokuwuxuwoludi.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/4965581721.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/vevele.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/nosakapev.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/ropejalodakedamitivo.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/guxibivo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/10544668610.pdfIn PDF document text
    • http://effektfilm.de/files/file/foserodiratowewuporenurun.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/gibumexo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/bce3700810a986dc056d2439255b98a1/39178468948.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/giboxakijupefefu.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/vovegasowuxugorada.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_off0000aa61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA61 10764 bytes
SHA-256: 7e00e803ea603f41b90a262614a744de0d1fdfb3f471b6b47f0cab821b337fbf
font_01_sfnt_off0000c350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 15044 bytes
SHA-256: 19148231496055104d04a76be79aba3decedbbd19c767ab312111918f228e849

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