Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e7489a3121c1146…

MALICIOUS

PDF

75.0 KB Created: 2021-05-14 23:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b43de2536ba1f68e20ec5e855d02d823 SHA-1: c49a1d2c3405fd2d23e74f462fdf4f315c7c9d04 SHA-256: 6e7489a3121c11468422148e2593b6c0d53416904295d8c9b07dc061a8e5c272
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 0.9993

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://midufefew.ru/strik?utm_term=ipod+nano+3rd+generation+case+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466676/normal_604e33f8c4687.pdfIn PDF document text
    • http://wotaxatumumodok.sportsontheweb.net/ascending_and_descending_order_worksheets_for_grade_6.pdfIn PDF document text
    • http://rodigevofu.iblogger.org/wotitesozodurijuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487916/normal_5fd98f718d8ec.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/icao_aviation_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417995/normal_606b926f04bb8.pdfIn PDF document text
    • http://zixaxagewan.mypressonline.com/59198845009.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494432/normal_6001e3a995e6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384828/normal_6005444e9ca0d.pdfIn PDF document text
    • http://xenipufuk.22web.org/jodekunuxov.pdfIn PDF document text
    • http://damomemisogadex.iblogger.org/worumugoxanenelabuzejegam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420586/normal_601caafd888ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_36b9592286964b2396b76dfd58e59e69.pdf?index=trueIn PDF document text
    • http://sanugifop.atwebpages.com/zuxidexokodomizedume.pdfIn PDF document text
    • http://lefivagalowo.rf.gd/honda_certified_pre_owned_warranty.pdfIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_bd7d7d56bc79443e821c87300372193e.pdf?index=trueIn PDF document text
    • http://kefujuvaw.epizy.com/react_native_modal_bottom_sheet.pdfIn PDF document text
    • http://faduzidivatakid.epizy.com/food_diary_template_word_doc.pdfIn PDF document text
    • http://lawiferow.myartsonline.com/negative_prefixes_exercises_worksheets.pdfIn PDF document text
    • http://xelopin.epizy.com/balada_de_amor_ao_vento_paulina_chiziane.pdfIn PDF document text
    • http://wupejubofuvom.rf.gd/systematic_literature_review_example_paper.pdfIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_fc0cff6528ca4aa99a939b1409be9a4d.pdf?index=trueIn PDF document text
    • http://zilajisalogu.epizy.com/67456830280.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_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 5372 bytes
SHA-256: 9a7533e30857ea738f59ec59e3276e5f5d4f39adfb6b1f922879e14eb7128c54
font_01_sfnt_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 11152 bytes
SHA-256: 5e60ba17409314c234acb4c30383e5860678e7562f8de7b07c6a499f46a2bb3f