Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaec1092d517baeb…

MALICIOUS

PDF

68.4 KB Created: 2021-03-05 10:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: abd3a37ada88ef5f723defe2181b269a SHA-1: 42c9fc1afe18e24948ac5ed556ef3660b5830721 SHA-256: eaec1092d517baeb637f05ca5dd1f817731201dcd53f2eaea162b64abb339811
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URL, https://jumiwimov.ru/award?keyword=linear+algebra+and+its+applications+solutions+4th+edition+pdf, suggests a lure to download content, likely a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URL indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=linear+algebra+and+its+applications+solutions+4th+edition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407813/normal_5ff9ca05465f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450440/normal_603b56ac70706.pdfIn PDF document text
    • http://xulazawelinuze.scienceontheweb.net/merimibikamixozep.pdfIn PDF document text
    • http://majikok.mygamesonline.org/it_jobs_in_demand_in_south_africa.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/euro_truck_simulator_2_keygen_free_download_ocean_of_games.pdfIn PDF document text
    • http://pelinebaj.mypressonline.com/what_is_chemical_weathering_definition.pdfIn PDF document text
    • http://kafofal.mygamesonline.org/how_to_cook_stuffed_crust_pizza_on_pizzazz.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/sotazaturirigafoxex.pdfIn PDF document text
    • http://penageli.getenjoyment.net/xizotijajiladazubonasuno.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/77703230810.pdfIn PDF document text
    • http://dipenoguzel.sportsontheweb.net/what_are_the_main_problems_in_society.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/2004_honda_odyssey_transmission_fluid_fill_hole.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/be6357e9-2308-4641-bdd5-4bf85c7950f4/henry_v_shakespeare_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64553ef9-0fc0-462d-a168-7bf681162b4c/intermatic_timer_set_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42b751fa-f1ca-45f0-b747-971f2da39666/can_you_calibrate_a_infrared_thermometer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474865eb-9743-4cbe-a7b0-7e820098225e/usmle_step_1_fee_for_img.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5446c36-6545-4a1c-a540-a9f70f911b8a/psychology_ciccarelli__white_4th_edition.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/international_truck_parts_houston_texas.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_off0000cc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC30 5588 bytes
SHA-256: 6db925e1f4e6a90250de269f4ce0d277e1ee761b2a23ccf73d56ac9aba4af7da
font_01_sfnt_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 10896 bytes
SHA-256: c9588fd636b85ca9280f5ac290ef40c131360b693537d0b181f6b40d46e804d5

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