Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90e04fff12fd987…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 05:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 55fdbee4c6dfaa501d4eef8c8c9c6ea0 SHA-1: b061f002620e60ec892f96be17cdca501c9d3594 SHA-256: e90e04fff12fd987e21c43edc5c9dd9a740eb5b4692213cd046ad9d4b00245db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to disposable hosting, characteristic of a link farm designed to distribute malicious files. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=house+of+night+book+9+pdf+free+download PDF link annotation
    • http://elvirajogsi.hu/ckfinder/userfiles/files/96932261667.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/nixitanebivok.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/kilelap.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/70820162949.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/35689119767.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/8453881353.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/xaraboduratabiniwanujone.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/kenarobe.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/226e705bf04004e7a121b0a0d3c5365b/siwezasogu.pdfIn PDF document text
    • http://budka39.ru/files/kuzurajipafi.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143dd74be23d---81573810141.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/52214714646.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/ditanowazezazatukebogif.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/texaludisugunel.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/30266488847.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/35329816547.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/68841791032.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/laxujulirudukire.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/ragelis.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/vepulirepajudomamob.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109161634268930.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614223f2c5fef---29637445387.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_off0000d3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C8 11356 bytes
SHA-256: d94f7c61f0c5291588950fef01e848a0e56ef464322ce213355ff5985d4bb996
font_01_sfnt_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 16776 bytes
SHA-256: 6e3c6d56dc6fb4e872f4bd7187cf78700afe7ac54cb5dd73fb3121bb8a76b208

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