Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1f876684be4f96…

MALICIOUS

PDF

106.0 KB Created: 2021-03-13 19:09:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4def7205d2bee3210ee8930fc3c320de SHA-1: b6d681d55a52ef5c4b8393d0c10f5645c96b8da0 SHA-256: 3a1f876684be4f968b5d6c53bf7ccb7d7756c5fa74154c4ed9cb64bd767ee52d
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document uses a lure related to "Chi- square test examples and answers" to disguise its malicious intent. It contains a high number of embedded URIs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mezovuduw.ru/123?utm_term=chi-+square+test+examples+and+answers PDF link annotation
    • http://zodimasar.mypressonline.com/how_he_loves_us_david_crowder_chords.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/are_mopping_robots_worth_it.pdfIn PDF document text
    • http://sapinatuligoro.22web.org/treasurer_s_report_in_a_meeting.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/11360794754.pdfIn PDF document text
    • http://monubagujizud.mywebcommunity.org/sex_and_the_city_season_1_episode_12.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/35201169613.pdfIn PDF document text
    • http://shoop-fh.ru/wen_56200i_super_quiet_2000-watt_portable_inverter_generator_reviews17j19.pdfIn PDF document text
    • http://fineagencyy.com/formel_for_areal_af_cirkeludsnitatknf.pdfIn PDF document text
    • http://liketime.fun/gta_cheat_apk_freei5t1m.pdfIn PDF document text
    • http://gaxesujite.medianewsonline.com/jeluxubinidifenur.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/survival_gear_list_2020.pdfIn PDF document text
    • http://zoxodur.sportsontheweb.net/understanding_movies_by_louis_giannetti_14th_edition.pdfIn PDF document text
    • http://8gusevshop.website/jefotezamegekudemiboxutklvd.pdfIn PDF document text
    • http://ideal-it.fun/how_much_does_a_commercial_coffee_maker_costbd99q.pdfIn PDF document text
    • http://rijepesejib.22web.org/mh_cet_law_2020_books.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
    • http://lelekon.epizy.com/55120585643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/801b7009-5132-4a51-9ca6-259dd613d0ce/how_to_grow_vertical_garden_at_home.pdfIn PDF document text
    • http://xobeminal.atwebpages.com/8826766176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b6153e-eff1-4a61-b082-fd51af833ff9/what_was_dracos_task_in_half_blood_prince.pdfIn PDF document text
    • http://burevomekevi.rf.gd/dungeons_and_dragons_players_handbook_nz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba343dd4-4ce8-48e0-8a60-3c2606e8fbd6/teten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd67032-4803-427e-877c-e4589b513141/42069016907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c941d795-8d85-4b7c-8071-054d3184c8a0/chapter_5_test_form_a_supply_answers_networks.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_off0001519e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519E 5312 bytes
SHA-256: 63a26b131b6b1639cecf6c7f9f895ab5430477a23806f324bd9567ab0ad707bd
font_01_sfnt_off0001639a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1639A 11644 bytes
SHA-256: 563008badb7fb573319efbf509d1aec525fe3b0c573ea0ec3aea9efca83fdb2f
font_02_sfnt_off00018b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B4F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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