Malicious PDF — malware analysis report

Static analysis result for SHA-256 773fcdbf645672ac…

MALICIOUS

PDF

83.8 KB Created: 2021-04-01 03:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b1256faaf377b1ed4dc80981326793e4 SHA-1: e1115a16b156fbaa8683c65dd2dc9ea44dd3262c SHA-256: 773fcdbf645672acd27695d055364bfb05938d3ea59ebfa3082b057dd8d4a72b
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm on disposable hosting, with one prominent external URI pointing to 'https://kuzutuzo.ru/123?utm_term=life+is+beautiful+movie+songs++doregama'. This indicates the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/123?utm_term=life+is+beautiful+movie+songs++doregama PDF link annotation
    • http://tozemudezajif.mygamesonline.org/numenera_maps_of_the_ninth_world.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/conair_clippers_power_screw_adjustment.pdfIn PDF document text
    • http://lowusonuraku.mygamesonline.org/tratamiento_absceso_dental.pdfIn PDF document text
    • http://xitodefigatefuj.medianewsonline.com/gakumasizafobesi.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/isabel_allende_books.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/5fjjct6/40439629203.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/eijNgdd/47030937090.pdfIn PDF document text
    • http://ribadubeko.scienceontheweb.net/systematic_sampling_method.pdfIn PDF document text
    • http://volupixo.mygamesonline.org/restaurant_architecture_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/misusulebix/66jefge/fondant_giraffe_cake_topper_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/id6Vwig/texas_campground_club_jamaica_beach.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/hwge0if/xidodonudanogevovogazi.pdfIn PDF document text
    • http://tigujumixekavo.22web.org/english_rap_bass_songs.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/divikufifir/baixar_whatsapp_gb_atualizado_2019_apk.pdfIn PDF document text
    • http://wukevivetarapu.myartsonline.com/william_blake_the_little_black_boy.pdfIn PDF document text
    • http://roveramo.atwebpages.com/fobox.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/saxeroz.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_70c7de7c9cf44b5b9d3685dcc2bc39bf.pdf?index=trueIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_e0d686c26e5746bd900046cc70888768.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/uniforme_adoratrices_logroo.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/bayliner_capri_2150_swim_platform.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/zabus.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_82b25dd311454b9789c543377eca7cb6.pdf?index=trueIn PDF document text
    • http://jusujewepexu.epizy.com/36897803078.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_off000107fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 5368 bytes
SHA-256: 85f71e8033df744ed09144bdd190f18c93ec1468f61d672e4c8182442155239f
font_01_sfnt_off00011a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 11748 bytes
SHA-256: 0590951fa75db6373395a5dd826b8a9201af29c174d177767b47a5d35f076449

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