Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e0abb70682f2eb…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 09:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ddf3f167d4a01789b8914c2a0c81c194 SHA-1: 57707484991376bfad673bc1d95357939c3fafdb SHA-256: 96e0abb70682f2ebc72b341266d864f359eee1609103afc43b454df5c7bfbcf7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or link-farming campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://nomylo.ru/uplcv?utm_term=nakama+2+student+activities+manual+pdf PDF link annotation
    • http://americasbestwingspa.iorderfoods.com/uploads/files/tiwugesoru.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/78603360860.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/vebono.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/regivuwakuduweb.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/63545323945.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/getizejuj.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4f57c6093f5c2bb32745a2a6460ddb2d/48025158168.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/piwudepasazamokevejelaw.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/38718227278.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161301266e08ef---zatulej.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/56588058056.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/risolori.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/buxabewiwidax.pdfIn PDF document text
    • http://guitarenko.fr/img/files/80483212668.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/sotisenufupefitixax.pdfIn PDF document text
    • http://foxhill101.com/userimages/sirofa.pdfIn PDF document text
    • http://sieuthibds.net/images/files/30747694245.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/ximadudopokupapofoder.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/67685951377.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/69760091602.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/90494655991.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/12045804389.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_off0000bc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3E 10916 bytes
SHA-256: 42dbed7c0e0d8b7de784aea0576ca1113cc87a8b55c9d59ace831200d63c24af
font_01_sfnt_off0000d59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 16520 bytes
SHA-256: 82e9242ebf47d8f1f8ffaf1d1f1a50e270ab0fa39d6f5f29a722bd47653ca4b1

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