Malicious PDF — malware analysis report

Static analysis result for SHA-256 203430514c0e3270…

MALICIOUS

PDF

73.4 KB Created: 2021-10-06 03:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4dd1dc0ab7703d7545ff862178a4d82f SHA-1: 8b48b764a244c79f869924212dfde5967278619f SHA-256: 203430514c0e32709b1aec41058e8de8862acfa3417a84c4b0e7fdabb6ec313e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=tip+top+drycleaners PDF link annotation
    • http://planet-for-events.de/userfiles/file/36908034454.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/7755055382.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/87099532163.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/27704552397.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/82273730182.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/fufisetazaturerifusa.pdfIn PDF document text
    • http://xycrusher.com/d/files/76641068535.pdfIn PDF document text
    • https://il-gusto.com/images/file/zujedoguzisozobuji.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/21735662037.pdfIn PDF document text
    • https://penzehir.com/dorceiys/ckfinder/userfiles/files/31572623268.pdfIn PDF document text
    • https://guijek.com/userfiles/file/moxunisekipefiti.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/bodovu.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/98520906952.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/87300562497.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/52211966987.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/73138869178.pdfIn PDF document text
    • https://premium-house.uz/images/file/11990830863.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/87281871240.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/90080782510.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/jewelususozeruxunamamigur.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aa7a55252---26794667773.pdfIn PDF document text
    • https://bunianco.com/other_files/File/dibeda.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/selezodewabi.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210918_021213.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_off0000bb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB96 10584 bytes
SHA-256: a6f1177ec2f8a297f5de5b911f9833c769fa3532d85d511829020df5b76acf0c
font_01_sfnt_off0000d3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E8 16964 bytes
SHA-256: 48dcde302fcf7b49c979c1d867f62b14a899847e0260624c176c53ee991c0481
font_02_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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