Malicious PDF — malware analysis report

Static analysis result for SHA-256 3608b0f256570b9e…

MALICIOUS

PDF

73.6 KB Created: 2021-02-28 21:33:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1d4ced2cfe839ffad2fb6e7df24bc470 SHA-1: bf3cf2d38faa857bc98fc75d5e623fcd1f526c0f SHA-256: 3608b0f256570b9e03260a2fa0497aa76f1f7c646a6dcfe1d5f216951c30f269
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 0.9877

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://bologen.ru/award?keyword=10+best+stops+on+road+to+hana PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460473/normal_601b491f1d074.pdfIn PDF document text
    • http://narulifiduguzez.iblogger.org/que_es_la_guerra_de_guerrillas_resumen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459060/normal_601555079eda8.pdfIn PDF document text
    • http://lighterusb24.site/perukek1az.pdfIn PDF document text
    • http://nizewapujapoj.22web.org/748628011.pdfIn PDF document text
    • http://govnosiakxws.online/modern_world_history_holt_mcdougal_online_textbookosbkj.pdfIn PDF document text
    • http://akfb.online/zijobatoveferefobonigugcq5t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374853/normal_6008dc66c1abf.pdfIn PDF document text
    • http://poroda.site/48081224910ca8ct.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459929/normal_5fe0f783ca55e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474176/normal_600d0411e72bd.pdfIn PDF document text
    • http://kvyovk.xyz/varifosetosib3mu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_6019699e32bbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502188/normal_5ff886e21f649.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dojidusajotat.epizy.com/briggs_and_stratton_vanguard_engine_reviews.pdfIn PDF document text
    • http://wedizakur.epizy.com/formal_letter_to_a_judge_template.pdfIn PDF document text
    • http://ninonasoligu.rf.gd/how_to_put_on_bob_weather_shield.pdfIn PDF document text
    • http://wafidifu.rf.gd/overtime_calculation_in_excel_format.pdfIn PDF document text
    • http://jogubemiviju.rf.gd/adrienne_rich_power.pdfIn PDF document text
    • http://jigufabusu.epizy.com/latest_news_bollywood_box_office_report.pdfIn 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_off0000ec27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 5256 bytes
SHA-256: 4200b96fdf9ec516f4aa77cb4a118f6ec19b93db3f5425ff939e66d1981aab2f
font_01_sfnt_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 10412 bytes
SHA-256: c63f31b9dfdf8101500e5968fe1339e17746b6d43fa654d11bfe33a7b9954aa0