Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4770ed8792f86b…

MALICIOUS

PDF

76.4 KB Created: 2021-03-27 11:55:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a343827fff8a73a238030ae4bebfd2b2 SHA-1: fd55b78fe25435908653c90d575b31c181c6856b SHA-256: ae4770ed8792f86be7c591d329d9c1cd90becd171f85ff5f2ceccd37dc435fa1
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically appearing as a lure for '8th grade science worksheets'. This URL redirects to a suspicious domain, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/award?keyword=8th+grade+science+worksheets+with+answer+key+pdf PDF link annotation
    • http://nizavevorupuj.mywebcommunity.org/wall_street_journal_delivery_address_change.pdfIn PDF document text
    • http://tarezirok.mypressonline.com/28957949558.pdfIn PDF document text
    • http://bluebadgeform.com/bakuzazudewenomikofere9topf.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/candida_erendira.pdfIn PDF document text
    • http://mirumumavetifun.mypressonline.com/how_to_prepare_consolidated_balance_sheet.pdfIn PDF document text
    • http://sobokapim.mypressonline.com/microscopio_electronico_y_sus_partes.pdfIn PDF document text
    • http://urolog.xyz/wordpress_plugin_development_step_by_step_tutorialstb78.pdfIn PDF document text
    • http://kipegujodup.getenjoyment.net/my_favorite_things_sound_of_music_piano_chords.pdfIn PDF document text
    • http://dipunag.getenjoyment.net/how_to_overcome_stress_eating.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/815269389032quou.pdfIn PDF document text
    • http://wigobike.sportsontheweb.net/50734394596.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/d42d5e2a-8e5d-4ccd-abac-b38f87aaa850/separating_john_updike_analysis.pdfIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_c7f11e560fb849309e51b847ac951af8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/free_utorrent_for_android_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd48b08e-4d4d-4625-9516-28b978ed484f/the_crown_season_4_complete_cast_list.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/que_es_el_contexto_familiar.pdfIn PDF document text
    • http://xasagode.myartsonline.com/31876045714.pdfIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_4d9505d65e0a4d4989bbb3cf4a5008b0.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_e80fc079520e4890b26bf769c7720b55.pdf?index=trueIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_4e07feb5e50e4c609392229188b2ae73.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e578ac4-9dd9-4e45-88c1-30f8ad0538d0/is_hbo_max_on_amazon_fire_stick.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/divera.pdfIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_3642df2d969c454c93e06c59f6766919.pdf?index=trueIn 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_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 5744 bytes
SHA-256: c3c5c047088e6f6e8a9759d7db332dba6e326efeedb66ee748b23200beffeae7
font_01_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 10512 bytes
SHA-256: 21b4e7d4837e413d6f8b1a6121e71beaf8481b761e0f75bc45767952831740bf

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