Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ca8247a390dcf7…

MALICIOUS

PDF

79.4 KB Created: 2021-03-31 13:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fa10766a70d8d4485860538b7ec6bd60 SHA-1: 2ccb36a307c805fa39d195dd31b020eaa6bb176e SHA-256: 47ca8247a390dcf75460fe3b29876d8009c683b9647f3006b8bf476b99c61524
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://nipisod.ru/strik?utm_term=definition+of+a+tropical+rainforest+climate PDF link annotation
    • http://mavogevuz.getenjoyment.net/learn_japanese_hiragana.pdfIn PDF document text
    • http://lokubakodo.getenjoyment.net/gojeparomefesotefobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471514/normal_602e84e36fe56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_6019335a0a190.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/jagjyJL/cara_bermain_multiplayer_di_city_racing_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/uFTKjee/metric_conversion_worksheet_1.pdfIn PDF document text
    • http://fesufobototezer.mywebcommunity.org/pc_wireless_gaming_receiver_for_xbox_360_controller_not_connecting.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383925/normal_5fc681549f870.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dopodisimedu.epizy.com/mifodawarefepat.pdfIn PDF document text
    • http://xomutojekes.myartsonline.com/fepumon.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/vanuzinovenewivor.pdfIn PDF document text
    • http://wepogevadapafa.atwebpages.com/vogalegon.pdfIn PDF document text
    • http://xafibejijopo.atwebpages.com/ortopedia_maxilar_integral_camilo_hurtado.pdfIn PDF document text
    • http://sofirenapirovo.rf.gd/46463549736.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/the_crown_season_1_episode_1_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/38543606807.pdfIn PDF document text
    • http://lemizirimafon.epizy.com/tavavasabop.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/business_case_template_for_additional_staff.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_off0000fa46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 5160 bytes
SHA-256: 57d685e44d515bba88db90f8b9ebc1f40a17d1d993a7989cf7ca6eaae1ca5a40
font_01_sfnt_off00010bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCA 10688 bytes
SHA-256: a9d31f45ad3dc1bbdc4dce9a67b8f4f1d7f04ed07047ff1b11439d726b86c936