Malicious PDF — malware analysis report

Static analysis result for SHA-256 283371b3f772ae8e…

MALICIOUS

PDF

76.1 KB Created: 2021-03-24 22:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5f8904fc33b22d7fd0dceb6c7715b34a SHA-1: c8cf5df634f336af8d3566b4ca568ab36d2af5a9 SHA-256: 283371b3f772ae8e6e81c23918db175833e41da1ba8ca7945cf9b530fc9d0214
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=transformar+de+pulgadas+a+centimetros+formula PDF link annotation
    • http://kapovulup.mywebcommunity.org/cost_accounting_standards_4.pdfIn PDF document text
    • https://cdn.sqhk.co/vekokizijam/iraPWjf/sebobatexepujidobowiji.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/avplTPv/63196430689.pdfIn PDF document text
    • http://kixorita.22web.org/43538760185.pdfIn PDF document text
    • https://winilogixibofop.weebly.com/uploads/1/3/1/4/131408061/6c18e67a94.pdfIn PDF document text
    • https://cdn.sqhk.co/zekoparan/jhdoQx2/disney_movie_quotes_quiz_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/jhggjdf/authentic_riddell_nfl_football_helmets.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/dibexegojuni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nalujisutu.epizy.com/elimination_chamber_2019_results_bleacher_report.pdfIn PDF document text
    • http://muluwokixo.onlinewebshop.net/calzada_definicion.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_a5b2e51e909847e792eca2c5177583a8.pdf?index=trueIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/palabras_de_enlace_en_mapas_conceptuales.pdfIn PDF document text
    • http://kugunimekuxaf.epizy.com/minonubojetalobo.pdfIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_9b2cc625307b48c690ef4fc2902f2b35.pdf?index=trueIn PDF document text
    • http://gemakeruw.epizy.com/free_intro_template_adobe_premiere.pdfIn PDF document text
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_f59182be45af44549136fc06afb885bc.pdf?index=trueIn PDF document text
    • http://rufegojokod.epizy.com/modern_world_history_patterns_of_interaction_california.pdfIn PDF document text
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_8fce89a1f7dc4bb7820dcd1d825796ca.pdf?index=trueIn PDF document text
    • http://sirulumen.rf.gd/after_effect_template_video.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_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 5424 bytes
SHA-256: e7ab87022c07a4b159fbbd7fe46aad4fcc0626d4161dae1497fe9fab5ef2400c
font_01_sfnt_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 12232 bytes
SHA-256: 90682195cf756a9a6a8984720aad36cd1f0bf9a7b1e67eb15a29f9fe1b6de5f3

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