Malicious PDF — malware analysis report

Static analysis result for SHA-256 2119d641019fcb79…

MALICIOUS

PDF

68.6 KB Created: 2021-09-10 10:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5b5ff427a85ff26accb02aa1801e7d6b SHA-1: 154cb0239331c490c0908879451f91499acf2142 SHA-256: 2119d641019fcb79667ce9e07f809a39b806f7ff0c0f9648f4c8ef7280e1aea6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://coretry.ru/uplcv?utm_term=what+makes+sammy+run+pdf PDF link annotation
    • http://globomax.eu/userfiles/file/pivitorijutak.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135a0ce0d98f---luduwopebovuwalebebodun.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/nofanefiraxozoti.pdfIn PDF document text
    • http://planetamama.ru/files/file/zizabomenidunuzuzudexidob.pdfIn PDF document text
    • http://medi-sen.com/files/files/32460171363.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/jufolepoxifufeva.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/kakixajadujukanivegiji.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/57921437189.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/kagibejonexujotajusof.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/wijefibup.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/vaxugobukagorasisaji.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/kevuzibigarezoge.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/25641732769.pdfIn PDF document text
    • http://charivne.info/images/file/51747450071.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/94810935084.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/jowovepikaxunebav.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/gidotejokazip.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/potimepejadevedosokoz.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/fabobevusipododudesax.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210908_032933_113.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c81c46e48---57115277496.pdfIn PDF document text
    • http://riph.pl/userfiles/file/sumasabareraworik.pdfIn PDF document text
    • https://expomediainc.com/upload/file/72241619090.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_off0000b01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01B 10804 bytes
SHA-256: 815bf749418ebf2ce175b53658eb2f4a853198605271ad6735dcf8d947eaff4d
font_01_sfnt_off0000c8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DC 14544 bytes
SHA-256: 22fd41e3520bd61f9dc62653e84e7fea812895db3fdbd6b16ede9a88e170d8e9
font_02_sfnt_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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