Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4cd4023c580c5f…

MALICIOUS

PDF

76.9 KB Created: 2021-03-14 09:44:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fa42e2133c88ceb2a9b37ef47322b969 SHA-1: 2631ccce72640eba2e9357d2c49a780d81c8c9ed SHA-256: eb4cd4023c580c5f28718d429c0298d68c262ec5efca85d9a0f4188439586186
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are flagged as link farms. The primary URL, 'https://jumiwimov.ru/award?keyword=asuhan+keperawatan+bronkopneumonia+pdf', suggests a lure to disguise malicious intent. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/award?keyword=asuhan+keperawatan+bronkopneumonia+pdf PDF link annotation
    • http://polikarmonolit.ru/the_art_of_reasoning_david_kelley_5th_editionyuny6.pdfIn PDF document text
    • http://universal-kirov.ru/elcometer_456_fnf_manualq83yw.pdfIn PDF document text
    • http://simkosa.website/personality_adjectives_exercises_upper_intermediate9om3k.pdfIn PDF document text
    • http://opencabinets.xyz/72463874fd6y0.pdfIn PDF document text
    • http://kersita.fun/vcf_file_to_converter_onlinekrhyt.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/77724903306i46qn.pdfIn PDF document text
    • http://ig-copyrightviolation.com/362586344721x1n6.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/baldurs_gate_3_multiplayer_waiting_for_otherss4ygn.pdfIn PDF document text
    • http://tohld.in/bodikugebiz812ln.pdfIn PDF document text
    • https://cdn.sqhk.co/javufikari/lgJ0ASB/jawix.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/iqggBTl/vorkath_without_dragon_hunter_crossbow.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/5Ayeiev/halloween_decorations_outdoor_sale.pdfIn PDF document text
    • http://dimax.website/667607544917q1l2.pdfIn PDF document text
    • http://masito.space/mavuwililomu84zo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/552d18a0-5eaf-44ce-8e99-3938e73b1316/and_to_think_that_i_saw_it_on_mulberry_street_book_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7296f59-669a-4bb9-87ed-2ccfc747c738/is_11th_physics_tough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48459df4-eb33-433c-b4fd-096a52155146/caloric_prestige_series_wall_oven_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a07ea3-6e3a-4426-a3d2-1c84b05ffdcc/83026322825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4dea15-633d-4994-b401-ebb121b487fc/personal_training_fitness_business_plan_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81d7f8f-f14f-4732-ba62-02d8b3b8d398/2014_volkswagen_passat_1.8_transmission_fluid_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cbd1818-98f3-4aa3-983d-3aaa9163336d/what_is_prince_hall_freemasonry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a62ceea6-f3c6-4e34-b329-7c6d7f1a5269/sebuzinadinufamuvubiputox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6164fd2-cac9-45b2-9425-0bf4767d5a37/c_programming_program_design_including_data_structures_7th_edition.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_off0000ecc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 5532 bytes
SHA-256: 8670e6cab620ec4d75a021ffbce35f1dc41c4de2d2825c2c03f212f9477bc93e
font_01_sfnt_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 10744 bytes
SHA-256: 12d5546edba9391eeae1d37ceefdc1e797a3c27da94e26e1584f1ba0f8b170df