Malicious PDF — malware analysis report

Static analysis result for SHA-256 948bab9c28340acb…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 03:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: db5a38eee02f70aa54a66df7c0aeba1e SHA-1: 41edb4f43ad3a862518e398e4d0ae0e94cba3ae4 SHA-256: 948bab9c28340acb6e0cce578397e0e21635527084ac068d29989d33804d5977
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it directs users to phishing or malicious websites. The PDF structure and embedded URLs are consistent with a spearphishing attachment used to redirect victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=bb+gaming+free+games+minecraft PDF link annotation
    • https://balarampurblock.in/ckfinder/userfiles/files/rijomujowoj.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/82048130003.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/22855022476.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202191225611874.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf9004971---97454304.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/15/92108332220.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/fikebemevodawogorare.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/57684396976.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/gulutiseju.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161353e367aa0a---65929270751.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109121121101763.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/812894867.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/xesewoz.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/pelotizuf.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/zufebataz.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910150448.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/12180500944.pdfIn PDF document text
    • http://jucal.es/images/file/loliwopasepagasulavifag.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/wexitaludi.pdfIn PDF document text
    • https://jagominum.com/contents/files/15179474376.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/99024890465.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/robefefugupezutapuzup.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/busuradavirokekuraxaza.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/58157386418.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_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 10704 bytes
SHA-256: 23175c296100789e0d5c8d60238e3059f9703bee31ac75e95b196f4a4c6b64df
font_01_sfnt_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 17624 bytes
SHA-256: 5cdaa01b5c8a73460f930a1a45b16ae8dd05e2b65c1441190af412bd07fe8532
font_02_sfnt_off000125aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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