Malicious PDF — malware analysis report

Static analysis result for SHA-256 4427a41dc70af9e8…

MALICIOUS

PDF

79.0 KB Created: 2021-04-16 02:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 60adfb3709cc42fbef4a4ed8933f18bf SHA-1: ae2839134dd888fdefdd26b5e9efd8ec246ac653 SHA-256: 4427a41dc70af9e820919a770d741819c9cdef99023721a6a9b19ceec67230c4
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates a potential phishing lure, attempting to trick users into believing they are accessing legitimate search results for technical documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gimoguvi.ru/strik?utm_term=chemical+engineers+handbook+john+h+perry+pdf PDF link annotation
    • http://de-bewertung-889562.icu/81173490090yu1nx.pdfIn PDF document text
    • http://mexicotop3.xyz/t-flight_hotas_one_ace_combat_7_xbox_one7q62s.pdfIn PDF document text
    • http://tiktokhd.design/hoja_de_balance_de_comprobacionpb742.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/b3ijgi8/offline_java_games_free_download_for_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/ygcL9ic/human_resource_management_jobs_salary_in_kenya.pdfIn PDF document text
    • http://frukt.space/94339549352myra.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/hdhafid/79093168046.pdfIn PDF document text
    • http://khareedforosh.com/what_is_meant_for_you_quotes_islam0d3y1.pdfIn PDF document text
    • http://dalnoboyi.xyz/sportpark_het_schootsveld_deventer_weather_reportc3dru.pdfIn PDF document text
    • https://cdn.sqhk.co/xudadidi/uPihhgi/73071032300.pdfIn PDF document text
    • http://look-hotel.com/perfect_modals_passive_voice_exercisesib1cm.pdfIn PDF document text
    • http://shimano-stradic.ru/kokiwilobhgvi4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://denekiwipe.rf.gd/properties_of_wave_function_in_quantum_mechanics.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/cgp_gcse_maths_workbook_answers_online_foundation.pdfIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_005f926d325848b59577d05c4e05b2a0.pdf?index=trueIn PDF document text
    • http://dalelotagu.rf.gd/93800402260.pdfIn PDF document text
    • http://sotemapepuko.epizy.com/hill_climb_bike_racing_game_apkpure.pdfIn PDF document text
    • http://periwof.rf.gd/kuwojegepodonulodutixef.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/35055173058.pdfIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_a50de15393f04e10a7a72b9033933377.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_3f39009065c1475aae5db6c388680bcd.pdf?index=trueIn PDF document text
    • https://0feddc0e-03bc-46a3-a741-45303deff239.filesusr.com/ugd/6ea6a2_b7f290b0a9b64db388b9822ce4014084.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 5684 bytes
SHA-256: 30c84d29334e9e518c7ee0ddf9ae5519f71863c6e1fd5062139477f89a8c5c51
font_01_sfnt_off0000fa8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 11036 bytes
SHA-256: 290ec14d377c05f1aa72dcdb1a6d978e835612c8805c48966f0f352dccf2dfe9
font_02_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2