Malicious PDF — malware analysis report

Static analysis result for SHA-256 66836af1e3db840c…

MALICIOUS

PDF

76.1 KB Created: 2021-03-30 11:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 48ea62370527a6e7ce0a4b98a52d2564 SHA-1: b1ba271d411e43a46ab09fce4819a4cd90627491 SHA-256: 66836af1e3db840ccf6adaf3272ace5ee9eaf551e002bfcc1ea31922c5b337ca
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 0.9990

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://jacksth.ru/award?keyword=handbook+of+electroencephalography+and+clinical+neurophysiology+pdf PDF link annotation
    • http://greenbike.shop/93555705977qlnrq.pdfIn PDF document text
    • http://wejesigozolireb.getenjoyment.net/types_of_accounting_information_system.pdfIn PDF document text
    • http://telgrm.site/kaththi_bgm_remix_masstamilan7bjs8.pdfIn PDF document text
    • http://paxosij.mygamesonline.org/data_analysis_software.pdfIn PDF document text
    • http://websporizle4.com/a_kwela_for_caitlin_sheet_musicokr2f.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/bosquejos_de_predicas_para_jovenes.pdfIn PDF document text
    • https://vebavorosufate.weebly.com/uploads/1/3/4/7/134742301/bugajiwelifeluwu.pdfIn PDF document text
    • http://copytoshka.ru/gopagaravojo0ca7h.pdfIn PDF document text
    • http://ropisunofo.mygamesonline.org/letter_of_recommendation_for_scholarship_from_principal.pdfIn PDF document text
    • http://firstreadersclub.com/50_nuances_de_grey_netflix_version_taylor7m6at.pdfIn PDF document text
    • https://pupikitonusu.weebly.com/uploads/1/3/5/3/135301263/temixulazu.pdfIn PDF document text
    • http://fridgeservice.ru/jirubemidafanajupudopp5fcn.pdfIn PDF document text
    • http://presentinsta.site/vebodakumotefiletoruredpjirh.pdfIn PDF document text
    • http://freedate18.xyz/68417208072go8zj.pdfIn PDF document text
    • https://xotototovizeta.weebly.com/uploads/1/3/2/3/132303406/jepelatip.pdfIn PDF document text
    • https://megewesaj.weebly.com/uploads/1/3/0/7/130738707/kobexem-nipot.pdfIn PDF document text
    • https://webunufilijamo.weebly.com/uploads/1/3/4/6/134677486/dcf2505.pdfIn PDF document text
    • http://rawiduti.medianewsonline.com/axe_fx_2_metal_presets.pdfIn PDF document text
    • http://fosireditoj.mygamesonline.org/ncaa_division_2_universities_in_texas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wonanikapudidak.atwebpages.com/14372992730.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/25916727296.pdfIn PDF document text
    • http://zepuwiz.atwebpages.com/7281524662.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/irritable_bowel_syndrome_guidelines_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/essential_anatomy_3_app_free.pdfIn PDF document text
    • http://weponigonimogo.myartsonline.com/zanegebuv.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_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 5684 bytes
SHA-256: 7d0da90fe645c202aebb8b0fa2893d42ebaa995cf70cb024eb452f631a959055
font_01_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 10796 bytes
SHA-256: 45a4ecc299ca332c7866152fdfdd0143ac3183cffe7826819b23d7236b8ff6c2

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