Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5647b89bbc2840…

MALICIOUS

PDF

152.0 KB Created: 2021-03-24 03:59:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8bbd359ecd25cf019fef4e0df94cae11 SHA-1: 2e9e930fbd94e1e5dce4aa8ba55406232fbffaa9 SHA-256: 4c5647b89bbc2840af2461db26d68a1f11edebe58422b7fd6d96781b5a2cccf9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://jumiwimov.ru/strik?utm_term=life+history+of+rabindranath+tagore+in+hindi PDF link annotation
    • https://cdn.sqhk.co/ledodatefu/KhbQjjO/coordinate_graph_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/VfCgjjg/inside_the_box_tv_show.pdfIn PDF document text
    • http://italysummer.fun/how_to_use_wella_professionals_colour_fresh_semi_permanent_hair_colourcp25w.pdfIn PDF document text
    • https://cdn.sqhk.co/zapinebow/rUjjhif/49040416533.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/yie4Ige/tomb_raider_movie_2018_review.pdfIn PDF document text
    • http://thesalle.xyz/bengali_font_for_whatsappuwje1.pdfIn PDF document text
    • https://cdn.sqhk.co/fafojipedul/goghihr/doodle_jump_logo.pdfIn PDF document text
    • https://cdn.sqhk.co/rivinodati/ajddBBJ/95951421779.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/djfhdgc/gudatupomoforez.pdfIn PDF document text
    • https://cdn.sqhk.co/zexetiminav/dtigLih/sentence_formation_with_cam.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/sgckgiS/79516390294.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://womilebejip.rf.gd/75545964266.pdfIn PDF document text
    • http://mujigivufutufu.rf.gd/vsepr_shapes_worksheet_with_answers.pdfIn PDF document text
    • http://wofofuzumoju.rf.gd/dvla_medical_form_sleep_apnoea.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/129174e8-3c57-413d-aa54-13d8ef22275e/libros_apocrifos_de_la_biblia_catolica_cuales_son.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4532afe-ee2d-4935-88b1-2a938d94a13e/49203281406.pdfIn PDF document text
    • http://witibepav.rf.gd/libro_formulacion_y_evaluacion_de_proyectos_rafael_mendez.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF99 5320 bytes
SHA-256: 035c4085aa868d0c3070ec838217dd3891b69d3f6da8129137d0d376b336f905
font_01_sfnt_off000201b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x201B3 11556 bytes
SHA-256: 0370f7d13f3e4f7abd65adcf427f9dc702b83c10439c2f51925ccc9b8d183d7a
font_02_sfnt_off000225ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x225CA 14852 bytes
SHA-256: 05016ed630a8846b65a7d7b292d112989864a718fe4160720b1f74c3d4c9e043

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