Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fa332cf200878e…

MALICIOUS

PDF

78.3 KB Created: 2021-03-04 01:18:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ffc4d681f0a3db2f751794e8b19ac988 SHA-1: 3ba0a6f9fc753e1069c9e511795d098ee759e98a SHA-256: a6fa332cf200878e29f84cc62f632e543e11ba90fd6840c6d98978b8c82889bc
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. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/wix?keyword=codingbat+array+1+answers+part+2 PDF link annotation
    • https://cdn.sqhk.co/vadezewe/idTgdib/90257063009.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/h2uicFB/55665933049.pdfIn PDF document text
    • https://cdn.sqhk.co/visobipibe/8hiwjge/hillside_drive_mullingar_house_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/fhghaZL/netflix_australia_login_website.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/614538328.pdfIn PDF document text
    • https://cdn.sqhk.co/tikikizeveni/ghihb8F/wituviraligagupono.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484834/normal_5fcdfdd153453.pdfIn PDF document text
    • https://cdn.sqhk.co/kebokeregim/gaIijjd/amazing_world_of_gumball_full_episodes_free_online.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/2005_jeep_grand_cherokee_electrical_system_problems.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417418/normal_602be2cfa781c.pdfIn PDF document text
    • http://worldhold.online/442771002103ltea.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/presto_cool_daddy_deep_fryer_basket.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_5fea35ebd2b04.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/0XAHHia/fadonitasuroxaponigobok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/norenuted.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/once_minutos_libro_resumen.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE700 5520 bytes
SHA-256: 2755caa1f731030cc464bcb42a2bcf9c1984f6e01e050f024a959913b241948a
font_01_sfnt_off0000f9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 15160 bytes
SHA-256: 893d936131e36095e288399dffa70eef9fbbfd2cae2d6d9083b9d2eea8865788