Malicious PDF — malware analysis report

Static analysis result for SHA-256 9494c591ab739e64…

MALICIOUS

PDF

74.9 KB Created: 2021-06-06 20:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 16cef416a7c79875012f699a65f4af91 SHA-1: 3e9897b634fda3cbe6bd6387b59a06323aeaec33 SHA-256: 9494c591ab739e6483a5f2ce63bc2b1fdf787cd210e9911d86730bf13cb42936
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, including one that appears to be a lure for 'Letasoft sound booster full free'. While no scripts were extracted, the PDF structure and the presence of many external links suggest it's designed to redirect users to potentially malicious sites, possibly for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pistant.ru/pbw?utm_term=letasoft+sound+booster+full+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365541/normal_601710570fbac.pdfIn PDF document text
    • https://molozotupinomel.weebly.com/uploads/1/3/4/3/134340336/2225b5fb.pdfIn PDF document text
    • https://zafuzumu.weebly.com/uploads/1/3/4/6/134674349/05959429a0.pdfIn PDF document text
    • https://siromalad.weebly.com/uploads/1/3/5/3/135312661/1fac7fe4df6f328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446642/normal_6024ef67c5c2b.pdfIn PDF document text
    • https://ganaletikuwefe.weebly.com/uploads/1/3/4/3/134306697/4dc2857a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474989/normal_5feff5ca7ed7b.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/e3575f76-401b-4c62-99a6-7f419eb67e98/el_vendedor_ms_grande_del_mundo_parte_2_resumen_por_captulos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dba3666-a19a-4b30-919d-4eb586596c7e/marketing_management_companies_in_sri_lanka.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/format_notice_of_meeting_and_agenda_sample.pdfIn PDF document text
    • http://rabopadob.pbworks.com/f/jeguzetixuledelubito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368a73b8-5de8-4f1f-a435-45e92be642c5/danapozeranigamav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f19e62ce-9a05-421e-b319-285c2ea72de8/wf_2630_epson_scan.pdfIn PDF document text
    • http://siwuromo.pbworks.com/f/solucionario_matemticas_1_bachillerato_santillana_proyecto_saber_hacer_serie_resuelve.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/f/what_is_the_best_vehicle_for_stealth_camping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4ff3a4f-7ca4-4b7a-ab2e-cb03542f1f5f/bus_driver_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6901204-8ff6-415c-b93e-4955ce37e924/nojowabe.pdfIn PDF document text
    • http://ravowibosu.pbworks.com/w/file/fetch/144476991/6th_sense_technology_seminar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df3aa954-da84-4ea9-85a5-087a1214ec55/philips_9000_shaver_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/807e71be-c6b4-4d59-94da-eb7fd20cf595/22975671411.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/w/file/fetch/144464649/how_does_horizontal_agarose_gel_electrophoresis_work_on_what_basis_does_it_separate_molecules.pdfIn PDF document text
    • http://mizelabe.pbworks.com/w/file/fetch/144535989/gubepib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d029fa-3724-41df-b667-e600197eda44/how_to_be_a_social_worker_without_a_degree_uk.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_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 4980 bytes
SHA-256: f8f71a4a2a83390f9326da34bf5ffb1e21e83e5919e59d4a304b3e845e04bbeb
font_01_sfnt_off0000f815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 11260 bytes
SHA-256: 473409ec40d8668ee3b5dacb650e74db34600304b1a9ad930edfd7c32edb332a