Malicious PDF — malware analysis report

Static analysis result for SHA-256 8029cacd75d443df…

MALICIOUS

PDF

77.4 KB Created: 2021-04-01 02:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 02e8f30b154d6e7957fef9420804bfdf SHA-1: e99451fb73e5457dc7e126586dd40b71960cbf0f SHA-256: 8029cacd75d443dfd6b57aca37f043cf785b1ed800acc6204d707983f67e3ce7
126 Risk Score

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 0.9996

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/123?utm_term=number+in+english+words+pdf PDF link annotation
    • https://cdn.sqhk.co/wodelaganav/pg7O2gc/96632380630.pdfIn PDF document text
    • http://siwikilapezufi.iblogger.org/what_are_your_biggest_weaknesses_best_answer.pdfIn PDF document text
    • http://manapuzasupin.sportsontheweb.net/botixeruvudiziwomuzazere.pdfIn PDF document text
    • http://rijexofugovu.medianewsonline.com/jolusakoxarekeludetenal.pdfIn PDF document text
    • http://wetebopoxegubu.iblogger.org/end_project_report_template.pdfIn PDF document text
    • http://zugobopepoj.sportsontheweb.net/imperatives_exercises_worksheets.pdfIn PDF document text
    • http://viteroludobano.mypressonline.com/64969154931.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/cBz6Ihi/16631095540.pdfIn PDF document text
    • http://wutujirola.22web.org/8999174243.pdfIn PDF document text
    • http://kawasus.scienceontheweb.net/vakuxepazarevexofesinarog.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/how_to_turn_on_proform_2000_treadmill.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejexe/21719431094.pdfIn PDF document text
    • http://ferodibev.onlinewebshop.net/vuburafitezazefawibir.pdfIn PDF document text
    • http://fogokenum.onlinewebshop.net/windsor_castle_history.pdfIn PDF document text
    • http://teluroluxeterez.myartsonline.com/periodic_table_of_commodities_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/jijamexarijuliki.pdfIn PDF document text
    • http://namezenidel.onlinewebshop.net/calculus_limits_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/avid_pro_tools_9.pdfIn PDF document text
    • http://jumerajoge.epizy.com/10195198330.pdfIn PDF document text
    • http://gepafelixadu.onlinewebshop.net/10208267697.pdfIn PDF document text
    • http://jefiwimagi.epizy.com/survival_games_pc_free_to_play_online.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/nzxt_guardian_921_rb_atx_mid_tower_case.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_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 5444 bytes
SHA-256: 5d8143db3f5162ba8c93180718b1a8c35235e1b29344da5afd211235d0a15ba6
font_01_sfnt_off0000fd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6C 13128 bytes
SHA-256: 16cd7a0f8e6ac2dda0b259986d8fc0db3c0d7a909b85a2e82132abd7f32a9bc5

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