Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee1dc474bff1024…

MALICIOUS

PDF

82.6 KB Created: 2021-03-13 23:25:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a3f11942740d3b9495a3a983f901cb89 SHA-1: 494175ff5d28f78361e905f4a81495bd0a4e637f SHA-256: 4ee1dc474bff10240ead4ddc2a508fddd37cfa9177e0d5daa69dd38aec38f329
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits vulnerabilities or contains malicious content. The presence of numerous external URIs, including one pointing to 'ponafet.ru/strik', suggests an attempt to redirect the user to a malicious site for further compromise. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a sophisticated link farm setup, reinforcing the phishing or malware distribution intent.

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://ponafet.ru/strik?utm_term=projekt+1065+book+pages PDF link annotation
    • http://dosijefa.mypressonline.com/pibowabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476288/normal_600c75ad18be6.pdfIn PDF document text
    • https://cdn.sqhk.co/fazejitev/M2Jzdgc/pifusurezibum.pdfIn PDF document text
    • https://cdn.sqhk.co/dimusokobab/jbhaaje/mountain_car_drive_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452161/normal_5fee71671bd3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415292/normal_5fcebe89e4146.pdfIn PDF document text
    • http://duvejajenivogik.getenjoyment.net/15475416681.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/how_much_can_a_pallet_jack_lift.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxogatuv/jScjhgP/redball_670_sprayer_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/logenuzupug/heCOOsI/tosogivefudimumujitanowi.pdfIn PDF document text
    • https://cdn.sqhk.co/regisanozoxo/NghGiec/sloth_goonies_meme_back_to_school.pdfIn PDF document text
    • http://xasowokudat.medianewsonline.com/40702178903.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/RBj0dja/61782330882.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/hbhbjjh/molina_marketplace_customer_service_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/tozimozeka/hakRJij/crossing_jordan_crossover_episodes.pdfIn PDF document text
    • http://nopezimugabotik.mygamesonline.org/how_deep_can_you_go_with_padi_advanced_open_water.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457861/normal_5ffa85ac2d9b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_603ef109055d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/neporezofov/lowabe.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/mozabekikivozital.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3c89e5-c4ab-40e3-b3a8-a378e99ed4b3/is_fusion_360_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0717124e-986b-44ba-a2cd-2dce7c83d70a/royal_caribbean_drinks_package_offers_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/what_size_sim_card_for_galaxy_s5.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 5708 bytes
SHA-256: 9bc558c80b67c311bfb78ca8493ea5e5aba461d68381313766e2e628006a4b73
font_01_sfnt_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 11840 bytes
SHA-256: 028990c153442d5ca1739d45f4174b891df23a346a47409c20b6c3818f8b41ae
font_02_sfnt_off000126ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126ED 16452 bytes
SHA-256: 85f4446896483ca33059fa25382f6ac4800384bf06f781a81a9af31184322154