Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61e5abf86431f1c…

MALICIOUS

PDF

97.5 KB Created: 2021-06-07 05:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5d0dd73b787fc733cda9384f44315855 SHA-1: 2f0cf4c1ae21fc30202d945e01f2626a1e770128 SHA-256: b61e5abf86431f1c10e85693f193a5420b1de473dc0be92f460358af9b458aee
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to 'crewmak.ru', which is likely used to redirect the user to a phishing or malware distribution site. The PDF's structure and embedded links suggest it is part of a link farm designed to obscure the final malicious destination.

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://crewmak.ru/pbw?utm_term=lipiduria+en+sindrome+nefrotico+sintomas PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ddf95b7-71b3-45c4-8709-10192eaef048/2012_the_dbq_project_imperialism_in_africa_mini-q_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5468be3-4e32-4b8b-bb35-49e00b5070f8/how_to_burn_3000_calories_a_day_by_walking.pdfIn PDF document text
    • http://kemususi.pbworks.com/f/buxotevilarogitavewabivo.pdfIn PDF document text
    • http://giribuv.pbworks.com/f/ninoxebapirem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f076d98-5a89-4e6e-99da-a5af1d7fb33c/how_to_connect_bose_quietcomfort_15_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/207c420b-4066-4572-a55d-1f99ac5e9acf/lee_child_make_me_goodreads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a485a9d-ef82-45d9-82b5-23df202e2ce8/volca_sample_909_kit.pdfIn PDF document text
    • http://disisopaz.pbworks.com/f/hum_royenge_itna_hame_maloom_nahi_hai_mp3_song_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b6ff02a-13d9-4cc1-b7a2-3cf4211e1898/fedex_tracking_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b4f0ab-4c02-4c87-b42c-581813139495/jikinapimitaxetanalekum.pdfIn PDF document text
    • http://lomubel.pbworks.com/f/definicin_de_contexto_social_segn_autores.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/f/esl_intermediate_christmas_reading_comprehension.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d152b66-7d76-4c1e-91f2-71ccb4d26d7b/twilight_book_chapter_2_summary.pdfIn PDF document text
    • http://zegugas.pbworks.com/f/tupapuf.pdfIn PDF document text
    • http://pexovobef.pbworks.com/w/file/fetch/144673008/lawerux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f15b6199-55f1-4960-89e1-5a089263a267/vunipoxuf.pdfIn PDF document text
    • http://jitijaloj.pbworks.com/f/15580332593.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_off00013de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE8 5212 bytes
SHA-256: 52433c647d1a81a7a58fbca012abd1003a006efcb1e7083aa3bd5c2f60742725
font_01_sfnt_off00014f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F91 12288 bytes
SHA-256: 2328d15a581ffef4862f31a1de69914884b4b797278d7bbab77e61f5f8bc733d

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