Malicious PDF — malware analysis report

Static analysis result for SHA-256 a131048e89168716…

MALICIOUS

PDF

75.9 KB Created: 2021-03-30 04:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6bf53dd7c495904c164daea93ebfab40 SHA-1: 665509bdd7daede1bcec10f7f78d13209090492e SHA-256: a131048e89168716d882b931019a403cbbea565e420f87190c85b68a0b39de41
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with several pointing to disposable hosting or suspicious domains, suggesting a link farm or distribution mechanism. The document body, though heavily obfuscated, contains keywords related to musical scores, likely serving as a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/award?keyword=fabelhafte+welt+der+amelie+noten+klavier+pdf PDF link annotation
    • https://rewusimivizegan.weebly.com/uploads/1/3/4/5/134578415/movur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419640/normal_60368499a2522.pdfIn PDF document text
    • http://tigesonepovar.66ghz.com/alarm_lock_dl2700_installation_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413702/normal_5ffaa38cc2b9e.pdfIn PDF document text
    • http://dujoxizuzepofom.iblogger.org/video_converter_mp4_to_divx.pdfIn PDF document text
    • https://fufaguda.weebly.com/uploads/1/3/0/7/130739251/815545.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/a9122af56f21f33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453129/normal_603b78c1e6b67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480397/normal_604ac9521fcb5.pdfIn PDF document text
    • https://vidiwubiref.weebly.com/uploads/1/3/0/8/130874646/05ce4a.pdfIn PDF document text
    • https://suwelebebos.weebly.com/uploads/1/3/5/9/135959353/8561978.pdfIn PDF document text
    • https://zedebofewel.weebly.com/uploads/1/3/4/5/134594015/mupiwimat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450355/normal_600d1b34b16ab.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/57b9d57c-d496-4570-96e1-a78518312f7a/el_mundo_feliz_resumen_por_capitulos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b6a0668-3284-46ba-b9dd-6a5daa01ce53/how_to_factory_reset_from_command_prompt_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72586731-3470-4569-9c0b-b7011ede0842/navukutomasosota.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/a_marvelous_work_and_a_wonder_lds_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4043b7dc-19fb-4e3a-8bf2-c88e84bf3f4b/nutri_ninja_auto_iq_blender_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/fotafasug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c6d9318-4e43-4485-8075-48437cc53c31/tetirezisu.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/pupakidugozanuxu.pdfIn PDF document text
    • http://kevakop.epizy.com/masukileka.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/75664588990.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_off0000e7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E7 5416 bytes
SHA-256: ba0d56c1c88415768493cf20d2aab6abac8952eb08fd9224e232ff361b04ab3d
font_01_sfnt_off0000fa3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 12120 bytes
SHA-256: 2ae7c2d44d3bd1e2af2ae0f08e31891abb3a511f3d8b9d542a1439197d0e6738