Malicious PDF — malware analysis report

Static analysis result for SHA-256 e950147b914e7bca…

MALICIOUS

PDF

66.6 KB Created: 2021-02-22 19:48:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fb5fe1438a45c51a2d8efec33f25869c SHA-1: 9b8c48f7237b0508b09d2a1c187077730dbb8e92 SHA-256: e950147b914e7bca93cef24ae6538369a6ce4d62dd0004622b7923f0685a2636
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crophysi.ru/123?utm_term=how+to+record+accrued+rent+income PDF link annotation
    • http://vnds-v.website/definition_of_corporate_strategic_planning_process_involvesfs20s.pdfIn PDF document text
    • http://vienvozvrat.site/ponyo_on_the_cliff_by_the_sea_english_dubgqgsg.pdfIn PDF document text
    • http://ottics.ru/halves_and_quarters_worksheet_free49vpl.pdfIn PDF document text
    • http://natikolom.site/sosobomeditebugibbscf.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/dSwhj3O/illusion_connect_date_guide_miyuki.pdfIn PDF document text
    • http://uscarinsurance.info/fundamentals_of_communication_systems9gpxv.pdfIn PDF document text
    • http://dontbeshy.xyz/belgium_short_stay_visa_application_formg7eax.pdfIn PDF document text
    • http://sait-ok.ru/audited_report_companies_act_2016mqr2w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389104/normal_60286458a8a6a.pdfIn PDF document text
    • https://cdn.sqhk.co/gevopobi/5hchhXZ/smart_launcher_themes_free_download.pdfIn PDF document text
    • http://akmurzina.com/74200534009z2hbg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC977 4928 bytes
SHA-256: cf95bda7bb2cce3813ce78d600a3e873ec1d7a619b919661fdf0e31785583ad7
font_01_sfnt_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 10324 bytes
SHA-256: 1f2ab4b287f7f95cd9e979a730dbde2a3e75114d0067a44c534a74d2a42f95a9