Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e78bf52fd133a9b…

MALICIOUS

PDF

91.1 KB Created: 2021-09-17 17:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8d3a7903f98ad94369fcd402526e8db SHA-1: 785d8fe14329895b88489dddb2777a1211c6af66 SHA-256: 4e78bf52fd133a9bb272e92da8455c8537c23e34a5cb9af71b0b0e163a6ad48e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous external URIs points towards an attempt to redirect the user to malicious content, likely leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=minecraft+online+game+play+free+3d PDF link annotation
    • https://ldoris.com/upfile/files/20210909190821.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406d6cac4f2---94533807250.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/gafewufubenow.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/74452967131.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/32807399569.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/87532104056.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/32675831698.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/musarufulenone.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/74368529778.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/81825501995.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/22780277862.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/50216492295.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/91416922701.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/vitexaredevazul.pdfIn PDF document text
    • http://byecook.com/ckupload/files/rozevaparovunerabiw.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/omamn61r858fqb3cbd2eqhsd3d/97748737936.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/zarubaruwixuvibavuve.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/7571499773.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/nutunuxuzebebez.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/pagevuzitasaxowe.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/dolelufin.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/1398468123.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/61359304156.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/xufunikefigosifopakudu.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_off0000ffd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F0 11072 bytes
SHA-256: d7e8df2b1197c264e1914cd7e1cdfe6c22de5f93716761f849f2378dbc17bd05
font_02_sfnt_off0001318c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318C 17012 bytes
SHA-256: aaf44a3caedae4a821273868306fcee80ed8d66d3cc94331b5f5701c02f7ad7f