Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11f93062c5cf6f2…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 14:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e3e56383e56aa424a88991e3c562181 SHA-1: 9546d14de0455ee9a2dc0e25c7013d05245773ca SHA-256: b11f93062c5cf6f2fee2dc2bd98eb77f063ec1b883e639162e51fe5828704326
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to external sites, characteristic of a link farm designed to distribute malicious content or phish users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and ClamAV detection strongly indicate malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=word+formation+exercises+for+class+8
    • http://worldofpacifiers.com/editor_uploads/system/files/sugexaxokebozupalov.pdf
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/vuripop.pdf
    • https://mobiligennari.com/userfiles/file/suzuz.pdf
    • https://vibangthuaphatlai.net/uploads/files/bojemovikodemamid.pdf
    • http://aquatherm-graz.at/files/65231695829.pdf
    • http://nenayu.com/filespath/files/20210917102800.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lejigilo.pdf
    • http://ducnhua.com/upload/files/5967061635.pdf
    • http://jsdarvin.com/files/zakukavudituveli.pdf
    • http://harc-ias.vn/Images_upload/files/90069990897.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143760403e85---foponen.pdf
    • https://ienter.bg/files/56101204583.pdf
    • https://fiberglasssupplydepot.com/userfiles/files/nadojirufenelo.pdf
    • http://systempro.kr/userData/board/file/48872883024.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/pumukezovimilabarazubil.pdf
    • http://meubelenindex.nl/images/uploads/bimobisenebipozutupebubu.pdf
    • https://hongmao.tw/uploads/files/202109200509029630.pdf
    • https://empresa-venta.hr/files/52748688110.pdf
    • http://net-work.cz/data/file/rokepunufikavexiges.pdf
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/92075449426.pdf
    • http://galettedesrois.eu/userfiles/file/12987885943.pdf
    • http://koreanhotpot.com/uploads/files/mumifak.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/061939508195.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b15b.bin
3f8803768a0f63c92c81e4f17a841b1cd02f1289d47e8a8adaabf7b008f07a7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB15B 16544 bytes
font_01_sfnt_off0000dbb2.bin
46db846d06be7dbbe3988a9e748f1558bc1579bc8765422538ba5618f8b8ee88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB2 10940 bytes
font_02_sfnt_off0000f510.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 16792 bytes

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