Malicious PDF — malware analysis report

Static analysis result for SHA-256 24aeaa79ce8d6bc4…

MALICIOUS

PDF

77.0 KB Created: 2021-05-12 04:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fca4679fb66bc19dcd73621cf529cd1 SHA-1: 98b92fed29539ad76e6f9a1852b4135a4650119d SHA-256: 24aeaa79ce8d6bc454a374e4ece0ab06ec6e6635c03da83a0d88fd708a914d2f
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as 'https://ponafet.ru/strik?utm_term=the+little+red+hen+and+the+ear+of+wheat+read+aloud', suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URIs point towards a malicious intent to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=the+little+red+hen+and+the+ear+of+wheat+read+aloud
    • http://voiprormul.xyz/epson_wf-3640_printer_error_code_0x9766xdf.pdf
    • https://cdn.sqhk.co/falupuvevore/YggkRjb/10607952086.pdf
    • https://cdn.sqhk.co/resozasevej/hggjiiZ/kazatokobifif.pdf
    • http://mimedilubaj.22web.org/78712969367.pdf
    • http://nubolutlion.xyz/alex_rider_season_2_release_date_usyj8mf.pdf
    • https://cdn.sqhk.co/kuretunaba/hhcheNh/water_to_wine_coloring_sheets.pdf
    • http://libuwapuvewipev.mywebcommunity.org/16456032859.pdf
    • https://cdn.sqhk.co/tagubutapa/h3giIij/bitdefender_antivirus_free_edition_2017.pdf
    • http://wowmarket.info/50417169894wdrf8.pdf
    • https://cdn.sqhk.co/kerametunal/HjbghB9/77107968699.pdf
    • http://patajafurep.mywebcommunity.org/tawotiwofe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://novizem.rf.gd/20253659707.pdf
    • https://uploads.strikinglycdn.com/files/8af9bca9-b45b-408f-9adb-e2f4eb1a1476/what_is_the_most_popular_wii_game.pdf
    • http://lajovaputap.myartsonline.com/sample_letter_of_appeal_to_health_insurance_company.pdf
    • http://nazowovemozugiv.myartsonline.com/calculus_and_its_applications_10th_edition_solutions_manual.pdf
    • http://fuzakumadobujav.epizy.com/bokigujutepib.pdf
    • http://wiwowefitupek.epizy.com/pimesaxunanaxozobitunu.pdf
    • http://jovofixelojepod.epizy.com/formato_web_archive.pdf
    • https://uploads.strikinglycdn.com/files/e341ef7f-2f17-40af-94b6-283fd553e7c2/how_to_program_xfinity_remote_to_control_samsung_soundbar.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ea.bin
ea19b1731a1647a04efb785db10234b63b63ffd7738ca6418dd92a7521e48f3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EA 4856 bytes
font_01_sfnt_off0000f66d.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 1800 bytes
font_02_sfnt_off0000fefa.bin
a8dfe9557aa01d0f14dd01ada90c6736bab1fafbe4596e3ec4006cd5c5c006c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 11076 bytes

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