Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a111e09a98d664…

MALICIOUS

PDF

79.7 KB Created: 2021-06-03 19:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9fd855f924b10faafce8275d74f0f684 SHA-1: 8040ba4dfba385111139bfc2d9bf2f06d18d8f56 SHA-256: 65a111e09a98d664004e138e5792e18e009f660e7f9c122fef68065774717d06
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://allytemp.ru/pbw?utm_term=solicitud+para+pedir+certificado+de+estudios+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495686/normal_603069119dc73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_6045fcfc4325f.pdfIn PDF document text
    • https://gewedawinun.weebly.com/uploads/1/3/4/7/134745389/lelipabojuvez.pdfIn PDF document text
    • https://kipobibupu.weebly.com/uploads/1/3/4/3/134367270/3758785.pdfIn PDF document text
    • https://berajuvexoru.weebly.com/uploads/1/3/1/8/131860787/xosepubofotuguf.pdfIn PDF document text
    • https://fevorixuf.weebly.com/uploads/1/3/4/6/134667435/xebalaj_dopusasura.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lururefisu.pbworks.com/f/nabutowusuvosul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d98751-0425-4b8f-ac66-1aa4c34dfb42/vikibajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00bb56c7-0635-473d-9492-6fa671abb2e4/more_stoichiometry_problems_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2b683bc-2ade-4e65-984e-762b05ea2ccc/lumevikarowirox.pdfIn PDF document text
    • http://jotoxipigi.pbworks.com/f/34112356274.pdfIn PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144411609/68024656535.pdfIn PDF document text
    • http://molitutolu.pbworks.com/f/what_is_the_interior_angle_of_a_polygon_with_7_sides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db2ca22-0161-4884-b523-b2bf48229df2/whirlpool_heavy_duty_thin_twin_lint_trap_replacement.pdfIn PDF document text
    • http://nowefuro.pbworks.com/f/kinds_of_adverbs_worksheets_for_grade_6_with_answers.pdfIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144548229/samsung_tv_cablevision_remote_control_code.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/w/file/fetch/144457416/formal_and_informal_email_writing_examples.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/w/file/fetch/144550266/what_are_unformatted_input_output_functions_in_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54708ecd-9fe4-4686-b75c-d13294f276fe/acca_jobs_in_toronto_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e89b686-e7bf-44da-ba44-544f2d0b6225/52195454093.pdfIn PDF document text
    • http://natutaliva.pbworks.com/f/23624976610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58c9af0-5c6a-4063-96ef-997843097c70/line_6_fbv_shortboard_foot_controller.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 5252 bytes
SHA-256: 8bbd3d016533d15f1b1804fa1317ccafb6f904b39b6363a9a7c84ab5b98a2965
font_01_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 11972 bytes
SHA-256: 80fe77564d97a4f48a051346438feda14055606115cda88ce1117ff4813cdc88
font_02_sfnt_off000119d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449