Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e2a43d16d48d14…

MALICIOUS

PDF

73.0 KB Created: 2021-06-05 21:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1d5ec801d3b37ff5df51584640021629 SHA-1: 3d8bcb415956be1374024f1d5d948173123bc3b2 SHA-256: a8e2a43d16d48d147563eb85be245f8d6293d169efcb7acb7ccea1d65dcfde19
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. One prominent URL, 'https://coretry.ru/pbw?utm_term=printable+calendar+march+2021+imom', is presented within the document's body, suggesting a lure to a phishing or malware distribution site. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious nature by identifying a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/pbw?utm_term=printable+calendar+march+2021+imom PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366317/normal_5ff149d1030b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_5fd2a5b8e763f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489032/normal_60407bf570b01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486969/normal_603e2f486ee78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369153/normal_606bebf780342.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466166/normal_5fdcf3b880d6c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fixiguru.pbworks.com/w/file/fetch/144618069/challenging_catastrophic_thinking_worksheet.pdfIn PDF document text
    • http://wiliser.pbworks.com/f/how_to_dns_bypass_icloud.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/f/descargar_halo_2_para_pc_gratis_en_espaol_completo_para_windows_8.1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c64bed-1d38-4440-a368-8abf9a94c1bd/folavofatiwaz.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144423858/alessandro_baratta_criminologia_critica.pdfIn PDF document text
    • http://werinenimuta.pbworks.com/f/machine_learning_vtu_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5741327a-d5df-4b54-bd2a-676e00847ed8/2687947371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd3bacc5-27c3-4e1c-9a0b-30f0925f687f/soduboxufililefalis.pdfIn PDF document text
    • http://barumena.pbworks.com/f/26631738210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46467af3-7f35-4387-a9aa-ecd99dc20762/52049714192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b0d429-d74b-4cc6-8dd8-ad174a522b3c/747889440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f52c3d-2cbc-46cf-9a1e-35a057536253/how_do_i_use_m_audio_keystation_49e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b38583-c460-4261-9523-0655f189c006/adding_mixed_number_fractions_with_same_denominators.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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 5468 bytes
SHA-256: 743eb8124a6852697c2b66c78d9d25325bd8ee96f10b195aa0ef3b43acd584c9
font_01_sfnt_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 11004 bytes
SHA-256: b96c7fe2b15553d2a6d9fc4cb91306d91bff511e5d97e45f021de11f39af1844

Open this report in the interactive analyzer, or submit your own file for analysis.