Malicious PDF — malware analysis report

Static analysis result for SHA-256 105f52b2ac99d63e…

MALICIOUS

PDF

75.8 KB Created: 2021-03-21 06:36:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc5ad63a2e1a5b8d1390a4f45349b55c SHA-1: ae143295a42e0ff2d3f1a35cd022809a53468218 SHA-256: 105f52b2ac99d63eb2bb4a3bcfc7f7f7f4f725118c71600d90031d679c2fd079
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics suggest the document is designed to redirect users to malicious content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/123?utm_term=adventure+communist+hack
    • http://sarhello.online/death_of_a_salesman_guided_reading_questions_act_1isjmx.pdf
    • https://zidipezes.weebly.com/uploads/1/3/5/3/135314083/8234406.pdf
    • http://ver-alex.website/audio_bedtime_stories_for_toddlers_online_freebjn5f.pdf
    • http://zavarivaemvmeste.ru/8203673786524625.pdf
    • http://zisuroto.mygamesonline.org/99801622413.pdf
    • http://shopyou.online/578814059851z4kx.pdf
    • https://bolojowugupi.weebly.com/uploads/1/3/4/8/134886087/fevif_nuluru_tuwawufo.pdf
    • http://fruktovik.com/videoshow_pro_for_pc_freewibqx.pdf
    • http://reduslimitalia.site/epson_stylus_nx410_driver5zqbx.pdf
    • http://winoorama.space/what_is_the_analysis_of_the_poem_if_by_rudyard_kiplingjmgzc.pdf
    • http://towufato.mywebcommunity.org/kidde_p3010cu_reviews.pdf
    • http://vexezujuzas.scienceontheweb.net/kolopexuvone.pdf
    • http://instacopyrighthelpteam.com/wills_eye_near_me3b9ks.pdf
    • http://lofitner.buzz/bakumanazojowdcr1.pdf
    • http://wonnaturila.space/75136873066sxpk6.pdf
    • http://libralab.digital/maze_runner_the_death_cure_full_movie_download_in_hindi_720p_blurayadhgv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5b74a729-8ddb-443f-bd9b-35761e4a0e70/nc_drivers_license_online_test.pdf
    • https://uploads.strikinglycdn.com/files/eec03061-a19b-4842-a581-e8554ffd9e38/what_is_the_first_agricultural_revolution.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb72.bin
20c55f1e23ddd71a070a154a49cc2508123039f949ff285ca69a3bfee63b8606		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 5260 bytes
font_01_sfnt_off0000fd2e.bin
2eed79e79fb8131863d15b90502a1cddd7a283ab5d39652bea30a1f3aefe8cd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 11060 bytes

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