Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a8327a147f9791…

MALICIOUS

PDF

74.7 KB Created: 2021-09-21 02:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5c23bac94761ee9d68f53a6e1cbeafd6 SHA-1: e3020cdbe6ab4bb01429542ec1ab158016ce600f SHA-256: e0a8327a147f979193de4c63f6cb4cc7bd06d366c2a6d97963a81fab1840d248
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the link farm heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://archism.ru/uplcv?utm_term=fast+%26+furious+1+full+movie PDF link annotation
    • http://zhihepvb.com/upload/ckimg/files/202109101100009497.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/33903325005.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/tubadizi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bti2qa2kn4830clf6l9q429e43/89544082772.pdfIn PDF document text
    • http://sunway.me/uploads/file/101307217675.pdfIn PDF document text
    • https://rafautama.com/uploads/file/robebatonef.pdfIn PDF document text
    • https://swiz.eu/files/editor/15995141306.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/pojowigiro.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109061409446150.pdfIn PDF document text
    • http://www.77ice.com/upload/files/dewatimulabiga.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/17392133225.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/sugom.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/fuvutugukilanisimab.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/27033956863.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/28768398389.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/99249260584.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/metetuxetiburawilusu.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/11380915359.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/43226692012.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/togelifexi.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/46972984931.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/73472355337.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/begemus.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/68511935822.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/zapejigejagozogapegokeb.pdfIn PDF document text
    • https://akemi.ro/hirek/file/91717296930.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_off0000bf88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF88 9476 bytes
SHA-256: f51d5d1ed6f87b52d1b9f429dd51402bf3eddb0f0727a485d5a13d2cfa109c79
font_01_sfnt_off0000d3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E7 20124 bytes
SHA-256: 5fa477ec69c227c337d343a366416b81ea35930bbae1e4489cc5baee954b5455
font_02_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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