Malicious PDF — malware analysis report

Static analysis result for SHA-256 2feedb4ef58d6fba…

MALICIOUS

PDF

77.4 KB Created: 2021-04-22 09:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 658444abfede3db596acf048bb0ef800 SHA-1: 811b19f73b6d588af8f27a0f0fa9bf2b32bc1344 SHA-256: 2feedb4ef58d6fba4547a585d66ac0dc4197f1180c52ecd3020197702d416429
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a common lure technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/strik?utm_term=operating+system+concepts+silberschatz PDF link annotation
    • http://pr-bux.online/8245256445lmxps.pdfIn PDF document text
    • http://gprofights.ru/biomes_o_plenty_minecrafto6h4g.pdfIn PDF document text
    • http://besemafobekilir.22web.org/application_form_for_us_tourist_visa.pdfIn PDF document text
    • http://salea.site/lopiloruropj37l.pdfIn PDF document text
    • http://zebisol.mypressonline.com/chagas_cardiomyopathy.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/30279299183c16hk.pdfIn PDF document text
    • http://tadurarawi.mypressonline.com/carfax_sample_report.pdfIn PDF document text
    • http://gavediteriremuv.medianewsonline.com/mesa_and_scarp_terrain_are_a_result_of_differential_erosions.pdfIn PDF document text
    • http://sugewute.22web.org/bitunidizugibebozoreged.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_88203e5201a44aec94e02c58291ee3b0.pdf?index=trueIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_a1c3a163562c4554b199673ebee626ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab2f82ba-5d96-422e-b157-6a080f922a1d/dell_optiplex_9020_sff_compatible_graphics_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86508677-66fa-475b-b68a-c4a413b24cb2/lazamexilukakujonotuzek.pdfIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_f0e0179ee5e2450b88316d6a77dfb229.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34718a4a-5659-4c26-9d3f-06db1325e496/romeo_and_juliet_full_movie_free_online_1996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e929165a-22bf-426e-8845-5d1f3fb89d23/57757784690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5177f961-6985-413c-8747-4ff673e8dd40/rokukafebone.pdfIn PDF document text
    • http://xamazaxalezamat.rf.gd/product_assortment_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b255734-ab8e-4a86-b9d2-80522cac65cb/wings_of_fire_graphic_novels_in_order.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_d7c055ee29b44c6fb063e37b0540de93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bebc38b-7444-46aa-bba3-0af1733ef70a/dunkin_donuts_frozen_coffee_nutrition_value.pdfIn PDF document text
    • http://gumusimigogasuz.onlinewebshop.net/overhead_absorption_costing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5334c73-a809-4953-8f50-84dfdb122aad/22002641109.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_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 5668 bytes
SHA-256: f583cb4d992a8bb865453acdee63d5f22bc5d1d3db0e7b719d07a01b80f99588
font_01_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 11160 bytes
SHA-256: a3f50ef5187a1fdaae2606f812ef14ecf8fbff6f6e60bf7287cefb74f58e8e32