Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb586e2373447c89…

MALICIOUS

PDF

90.9 KB Created: 2021-09-15 10:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7d6508925ce1c73d50c2be5a03d25cc9 SHA-1: 4dde7fb18f3bca90f0de8423a24c9b817be7fd6c SHA-256: bb586e2373447c89ef1e717e3ea5483edb476122cf15c21bd9d3e672108f7ee5
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 0.9923

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=biology+key+answer+2020+pdf PDF link annotation
    • http://sangjeom.com/userfiles/file///81656110517.pdfIn PDF document text
    • https://geloracinta.com/contents/files/muxugepurijubopikutonubil.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/qtgoarpvc06samu9heoj28e8u5/lewoxojedagujad.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/48526956345.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/42939717075.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/webabusumoxudivixopikeg.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/vomopiv.pdfIn PDF document text
    • https://resicolor.com/upload/files/46965253582.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/39110078864.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090709155273499.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/bisitulobowawolivixuzuseg.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/475908963.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/84870775485.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/830df4adc9b6e8aa67860c80b177a3e3/39505327083.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/tigivinawodedelovu.pdfIn PDF document text
    • https://brs.jo/userfiles/files/wetudewizafinujage.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/xizatiki.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/sonetudevinabugipajelufus.pdfIn PDF document text
    • http://01host.ru/userfiles/files/21474706690.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/80536771000.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/39422988825.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/fidike.pdfIn PDF document text
    • http://sinoorchids.com/image/file/65853415688.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/sisebutonikitexevedi.pdfIn PDF document text
    • http://selidbe-beograd.info/files/61512823916.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 20436 bytes
SHA-256: 2e1d07ace18f69edcb6d1d5b7f3514167f9f125c680ba6ffc5bdfe756e162ed7
font_01_sfnt_off0001151a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151A 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off00012b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B09 11164 bytes
SHA-256: ca7d4aaf15900a6dc95a60f4c54f2f4c75be5533f802e78a47d8ef99c237a9b9
font_03_sfnt_off0001452b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1