Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21d346d746cb3c3…

MALICIOUS

PDF

77.2 KB Created: 2021-03-17 10:31:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2cfa86b421bb8bc6c26ddbdbe70705b0 SHA-1: 570c805761dc345fe6781472283026f8e820c948 SHA-256: b21d346d746cb3c391e3bb25614d34296dff02723b1ccf6bc674b6a0212a7d89
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/award?keyword=inverse+of+a+3x3+matrix+pdf PDF link annotation
    • http://ruwufuwetoj.mygamesonline.org/g_shock_5081_ga_100cf_price.pdfIn PDF document text
    • http://saxosoxajivovud.medianewsonline.com/aminoglucosidos_2020.pdfIn PDF document text
    • http://senteber.site/mine_engineer_salary_australiakfwwa.pdfIn PDF document text
    • http://yeswins.space/samemeganavusevofopwiuvw.pdfIn PDF document text
    • http://laitlabs.pro/59066569288hmopi.pdfIn PDF document text
    • https://cdn.sqhk.co/tesigasefaxe/bygcljh/osrs_defence_tank_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/ogijfim/73676355830.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/gfgijjh/fiwawoke.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/brahmo_samaj_in_telugu.pdfIn PDF document text
    • http://easterthjg.com/google_sheets_dependent_drop_down_listb5vuc.pdfIn PDF document text
    • http://dutarotanazosuv.medianewsonline.com/nuzegamipazudifagerosatus.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/78240531804.pdfIn PDF document text
    • http://kovativegapok.getenjoyment.net/the_secret_life_of_the_american_teenager_season_4_episode_13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gefuwaw.atwebpages.com/xixukuvoxubuzomi.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_171f901bb69e4dc3b8c60e86bce6d676.pdf?index=trueIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_a1ef3d63eb2c422db4dc4f60134066a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57d010e8-bd5d-41c7-9f6f-dc8031c0dd54/predicas_cristianas_cuando_lo_que_dios_hace_no_tiene_sentido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e87c1d-07c1-4361-8c38-003cbbbb6579/68380805800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c8d035-fff0-488a-90b8-c751f540c440/terapia_cognitivo_conductual_para_nios_con_tdah.pdfIn PDF document text
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_c26a458d558b4c819d7f0a8303839b98.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b1c0a91-279e-45d6-af35-96caade098ac/juwijunosulanixuxepefo.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_5524e459560b4c84a52630a88223f055.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09a64c4d-3900-4285-b59c-2a2a44502603/how_to_change_battery_on_liberty_safe.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_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 5384 bytes
SHA-256: 7f8a566983653501710a8c4145655f589b06c5ebd7abb2b115a2eb8a96b609fa
font_01_sfnt_off0000fed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 11936 bytes
SHA-256: 9444e2d0a13d69bb9e8c8a31c7accd0634ab849eab4986f766b5370fbfad4bec

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