Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a8d3461a27b8f5…

MALICIOUS

PDF

103.5 KB Created: 2021-06-10 02:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0cf326ba7df99babc2b42b7ea070bd93 SHA-1: 15e3b169ed5d071bef50f48fc8b4dab6a195e8e0 SHA-256: e2a8d3461a27b8f55680b225e40c36a5e779aae86931b97b79e0cf3484219575
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 0.9997

Heuristics 5

  • 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.
  • 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://huntic.ru/pbw?utm_term=funny+anchoring+script+for+farewell PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450439/normal_606e74b3a82ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423430/normal_6026320054f27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_6066f64e69ccf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417405/normal_6031db940c096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468530/normal_606e0cd8c3e47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403565/normal_6066e8a727213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459935/normal_60c04c0ced4ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466666/normal_60beda0c23dce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384819/normal_5feba9228cba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387230/normal_601f020e283c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://rujuboxu.pbworks.com/w/file/fetch/144720009/good_books_for_12_year_olds_fantasy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0161677e-e466-42a6-861a-1134bfeff339/23913409759.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/w/file/fetch/144483693/bewumifepatalipozu.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144411951/construction_site_visit_report_format_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b49aa7-e93e-4573-a74b-31bec8713c41/wolf_range_parts_near_me.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/maria_montessori_principles_of_education.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/f/9921815617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3719073e-ddf9-45eb-9220-85d299fedd94/kujinako.pdfIn PDF document text
    • http://niluputevi.pbworks.com/w/file/fetch/144588747/descargar_musica_cristiana_de_avivamiento_y_jubilo.pdfIn PDF document text
    • http://tevimunon.pbworks.com/f/39949776504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/884fb0aa-7ac7-4225-ac17-85fd171b9751/who_owns_the_mouawad_1001_nights_diamond_purse.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA5 5424 bytes
SHA-256: 02bb0c63cef61a676ad99fd9b42f821ba105339d0ab008448512980ff127eb34
font_01_sfnt_off00014f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F35 10724 bytes
SHA-256: 34be9cfbc4e012f46dde64abc84720249e4895ca49c1f69a7d60ea2b0e93a8be
font_02_sfnt_off00017408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17408 8792 bytes
SHA-256: f1cbbf7b4c15975f8bc1a062d0ec30172263126950b3be298e0001cec121672b