Malicious PDF — malware analysis report

Static analysis result for SHA-256 32af53e8ea99bfd0…

MALICIOUS

PDF

82.2 KB Created: 2021-06-14 12:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: efafa781a6d7732d93e70d31d5ce5c0b SHA-1: cf63726833f5048a990adfe61f2d01ec89bdc02c SHA-256: 32af53e8ea99bfd02bd7739826f46700fa9a9f413ffa213f0fd20bc16fa498b1
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 trojan. It contains numerous embedded URLs, with one prominent external URI pointing to 'zajinet.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme.

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://zajinet.ru/123?utm_term=best+bluetooth+mouse+app+for+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419001/normal_601cda7241438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457590/normal_6013870ac83e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/926ced10-c3fa-419b-b11a-d5eac8bc801d/libro_ciencias_sociales_1_colegio_de_bachilleres.pdfIn PDF document text
    • http://biwonuv.pbworks.com/w/file/fetch/145022010/91871482205.pdfIn PDF document text
    • http://samopusadadu.pbworks.com/f/kovope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/055bb78f-b360-4339-8da5-1db7326e35c9/77832096723.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/ejercicios_de_matematicas_para_segundo_grado_de_secundaria_resueltos.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/13631344804.pdfIn PDF document text
    • http://dazokarodu.pbworks.com/w/file/fetch/144914670/chhota_bheem_and_the_throne_of_bali_full_movie_download_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6629fc7f-bf71-479d-bab1-05474915ceb1/killing_joke_batman_comic_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/984f53e8-188d-4ba6-873e-42fa74504835/42148242254.pdfIn PDF document text
    • http://nugewus.pbworks.com/f/20451103223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ed755bd-f550-4572-b296-3a8546dcc737/77219069000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d81d3b-8157-4bfa-ad71-cbb042e1b963/how_do_you_make_jerky_in_an_electric_smoker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6904f7f0-8322-424a-8e2e-1b2d91079c16/34428532525.pdfIn PDF document text
    • http://finepade.pbworks.com/f/de_profesores_de_jerga_en_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b8daf03-7f9e-424b-a7ea-2352206e2aa5/mewafelezubokekumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d412e63c-6d60-4344-bd30-4aecc92987c3/what_does_low_anion_gap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66dca161-e877-4613-b558-efb8edcf23a9/how_to_stop_yourself_from_waking_up_in_a_lucid_dream.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c89d99-2349-4eeb-a12f-3c499f702b19/will_pokemon_brick_bronze_come_back.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecbd2ba3-377f-4b1c-b7e7-a9b81fec1eb6/what_is_the_difference_between_the_ti-84_and_ti-84_plus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 5352 bytes
SHA-256: a2aee94dec17623ebfc0e51d8a4b94d1e01f274ae9c4e4f435521cd31e3d0021
font_01_sfnt_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 10844 bytes
SHA-256: fd03b7320770cbf5d6e8ea57847637c19c846a7717818f10564026fb8ebe9d0b
font_02_sfnt_off00012d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D88 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176