Malicious PDF — malware analysis report

Static analysis result for SHA-256 50092d5a94769e8d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-26 00:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a41c6ee9e1f33c8b0286b96eacd9ec4 SHA-1: 309f104a292f44e319c0a19d24cb846617914583 SHA-256: 50092d5a94769e8d6dbcc97a9752a0adf5a9da66ada987084a59ca8c3b3fd663
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or scam attempt. The presence of embedded URLs and the overall structure point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=abrir+cbr+android PDF link annotation
    • http://sochi-riba.ru/ckfinder/userfiles/files/99888247708.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/baxobemonenijeba.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/pasepowusedorifotisesuvus.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/33654706768.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/666c30fc78ab472aaf9b57c3437f9951/97852233479.pdfIn PDF document text
    • http://pileki.com/imgup/file/xitokefate.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/goruvigibuvov.pdfIn PDF document text
    • http://space-edge.com/upload/files/kalexetejetowesivokoguluv.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/rakazod.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/25526654459.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/89907074800.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/96822088515.pdfIn PDF document text
    • https://anvatsaigon.suzukihungyen.net/data/dulieu/files/zijepoxut.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/95918274873.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613376d6bc48f---segolasimodisomipaboda.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/rafunum.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210916080540.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/70794847199.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210909055401.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/nedozatevufudebivipa.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/46407177662.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/reremajepopaxew.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_off0000bc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5E 19840 bytes
SHA-256: e28e7de5e006f08e054063ee275b5c14e111619f026823a1d7a0f12054e123ca
font_01_sfnt_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 10040 bytes
SHA-256: e313f4d4ac56faf529c2d09ba3a12036887bb332c50f2ef3f9f53875d69852f8

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