Malicious PDF — malware analysis report

Static analysis result for SHA-256 993362b2e78ff39c…

MALICIOUS

PDF

92.0 KB Created: 2021-03-25 12:33:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d91deaccc942f0582c7b669c628c4d07 SHA-1: cea9f99002f72c17e18548205798b7edc7826151 SHA-256: 993362b2e78ff39c3bcb8d5f90de1a14fadcc7f63bf24386732400df13efa2c1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. The embedded URLs are the primary indicators of compromise, pointing to potentially malicious or SEO-abused content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://leonvi.ru/123?utm_term=effects+of+noise+reading+answers+with+explanation PDF link annotation
    • https://cdn.sqhk.co/melalisopapu/3ThLHT7/how_can_i_recover_my_old_photos.pdfIn PDF document text
    • https://cdn.sqhk.co/gegojagakexu/iPQgcua/jutuxemawexikototuxoziwo.pdfIn PDF document text
    • http://rapugazif.22web.org/temipidejofitazofi.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/ymibVia/6318831027.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/c3jaggp/15442307272.pdfIn PDF document text
    • http://copyrightreports.com/incident_report_writing_powerpoint38mgk.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/3mng4yN/zong_free_internet_check_code.pdfIn PDF document text
    • https://kawuzuvom.weebly.com/uploads/1/3/1/3/131379118/xarezadede-pipurinapirawas.pdfIn PDF document text
    • https://xosovixa.weebly.com/uploads/1/3/4/3/134318585/vaguguvekokage.pdfIn PDF document text
    • http://bitjoms.xyz/41244956855tnq5c.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxapivasif/ibKjcid/recorder_instrument_online.pdfIn PDF document text
    • https://tuvopezape.weebly.com/uploads/1/3/4/7/134712323/ee341c427b.pdfIn PDF document text
    • https://cdn.sqhk.co/zexatexa/gfohchc/9727988198.pdfIn PDF document text
    • http://musc-media.xyz/7660216126hhbox.pdfIn PDF document text
    • https://cdn.sqhk.co/xawemubimaj/jcgjKqt/receita_de_glace_real_para_bolo_de_noiva.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/pzkihia/pixel_car_racer_wowski_mod_apk_download.pdfIn PDF document text
    • https://mofibowego.weebly.com/uploads/1/3/1/4/131406437/5135492.pdfIn PDF document text
    • https://motisodufar.weebly.com/uploads/1/3/5/4/135400919/fb090f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad0a6aa5-1cb2-49c1-af50-c01f3c6153a5/wuxuvuxisemokotikaz.pdfIn PDF document text
    • http://vonolukover.epizy.com/sarkari_results_group_d_answer_key_2019.pdfIn PDF document text
    • http://puwogufipuja.epizy.com/libro_de_historia_universal_2_ao_santillana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6246bf36-9c2a-422f-9425-2e9587cd5f45/old_school_runescape_bonds_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b60e7e63-71c4-435f-bb66-7a5f8f53461c/panasonic_hvx200_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b499d2-b468-47ee-90c9-f2f2786644d7/how_do_i_change_ownership_of_a_kindle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df21167b-4205-4b40-ab91-e6e7633a3bf3/operations_research_undergraduate_degree.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_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 5536 bytes
SHA-256: 688909b834d0ff5c455ce36cfebb8a5273e2b53224041d5891480dc70c4bf0a7
font_01_sfnt_off0001196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 23156 bytes
SHA-256: 36654dc69d68a80e2c06ceaa02de0bd97a8117359223e37a69ccf4cff4046d13
font_02_sfnt_off00014c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C15 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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