Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d20512c759905bd…

MALICIOUS

PDF

74.2 KB Created: 2021-09-13 15:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 531c52e17e052accbdbcd0f0bd502693 SHA-1: d6a1f3107e93f18a319539a364cdf9069fed698e SHA-256: 2d20512c759905bde5ce395759d42e53e3e456a89534c3b669d0a8140a981ec7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites for phishing or malware. No scripts were extracted, but the structure and URL distribution point towards a common PDF-based distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://4of100churchstreet.com/assets/media/files/tojopisutatugarevibosuj.pdf In PDF document text
    • http://shriadinathbank.com/uploads/76851603236.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161325549dba5b---rogupu.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/tataxo.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/dofegebufibibefuzetitot.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/21072867165.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/97159809337.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/94375062268.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/gevanojuta.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/8585099642.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109021121373033.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/bivanewifimifotavapu.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/49433516940.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/76348230918.pdfIn PDF document text
    • http://fgosvo.ru/files/files/29050021077.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307958c29a7---64163515315.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/19537627656.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/pubatadexilimagono.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/jenevididomutisetolibiz.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/vupuwojelowudewuvofaj.pdfIn PDF document text
    • http://torgoborud.org/images/file/45213208958.pdfIn PDF document text
    • http://salespate.com/userfiles/file/74783365822.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/27013512367.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/46870902461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=factory+reset+chinese+phonePDF link annotation
    • 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_off0000bee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE0 17280 bytes
SHA-256: aeaac478fb0efef4ce0cdc6767504e3f36e7080d522906e1fca69fdb725c4a4e
font_01_sfnt_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 10516 bytes
SHA-256: d290839bd373ea89e6497bf08d84b4bd06d56464dd8cf22b0732c027b404e139
font_02_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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