Malicious PDF — malware analysis report

Static analysis result for SHA-256 445442a404488caa…

MALICIOUS

PDF

76.2 KB Created: 2021-03-21 10:26:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e9f10f0f045bb066ced2b831959d8345 SHA-1: da90be3d8c81ff2840503f0404cff9a20aabdb70 SHA-256: 445442a404488caa506b5975c3534e5a01163ff789315cbce8919a5580d15c4a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL, 'https://maypoin.ru/strik?utm_term=introductory+mathematical+analysis+13th+edition+pdf', being flagged as suspicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://maypoin.ru/strik?utm_term=introductory+mathematical+analysis+13th+edition+pdf PDF link annotation
    • http://latuha.com/loxosivuwoxamamufatunis4yctg.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/jjhhSja/brass_quartet_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/riluvexudeve/Vieiejh/vipofanazepigolifebiwoz.pdfIn PDF document text
    • http://pagebake.com/the_power_of_one_chapter_22_summarycqt81.pdfIn PDF document text
    • http://sozetil.66ghz.com/sequences_of_transformations_worksheet_answers.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/sarah_plain_and_tall_skylark_casttt86t.pdfIn PDF document text
    • http://pravagims.net/woodshop_classes_onlinerdsik.pdfIn PDF document text
    • https://cdn.sqhk.co/towitudamuga/puXcfja/65461002053.pdfIn PDF document text
    • http://bitcoinov.site/680940884403ulh6.pdfIn PDF document text
    • http://nawogevimogagu.22web.org/american_pie_2_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/gghdgj1/i_wish_apple_store_ujjain.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CqLhfN7/localizar_mi_android_por_gps.pdfIn PDF document text
    • http://ratubave.22web.org/cells_and_functions_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wazimeb.rf.gd/modelo_contrato_de_arrendamiento_de_vivienda_urbana_legis.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/64959839038.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/creatine_monohydrate_gnc_pro_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/xobepi.pdfIn PDF document text
    • http://ragomoxos.rf.gd/60407799549.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_eaebcc3691a34a079613d976da74ccea.pdf?index=trueIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_32abb9058a9f4d9c97f939795a525ed7.pdf?index=trueIn PDF document text
    • http://vifowas.epizy.com/franklin_county_chambersburg_pa_docket_sheets.pdfIn PDF document text
    • http://folapopapewoxa.rf.gd/danufowikozekezefigori.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/27085313879.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/kixavofigugifi.pdfIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_2adf3b585c224015a3403723c1b25ce2.pdf?index=trueIn PDF document text
    • http://vodugesivizere.epizy.com/15220259215.pdfIn PDF document text
    • http://tajuxubixasisew.epizy.com/el_libro_zend_avesta.pdfIn PDF document text
    • http://tiluremuxaz.epizy.com/episode_guide_downton_abbey_season_6.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_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 5648 bytes
SHA-256: 9b515cc07008d181b2fb2b1eaa6b0eeeb948b297ce4d3c140c9b3590697cf5bf
font_01_sfnt_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 10500 bytes
SHA-256: 2441897afc5300962e7a96ef5b3213cee1999bb15e460ce4fc062bdeb895697a