Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b91b01c7844813c…

MALICIOUS

PDF

80.7 KB Created: 2021-04-17 16:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 74f943b9416563390ef4aaef26daf276 SHA-1: 5906135506bf3e4573c598de20006d5920c5aaa1 SHA-256: 3b91b01c7844813c8d8006f2f7ca822b449eee45c19af95fd6aab7f19af26f57
186 Risk Score

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/strik?utm_term=all+clad+6.5+qt+slow+cooker+ceramic+insert PDF link annotation
    • https://cdn.sqhk.co/betewulo/Y6Qauhb/hotstar_web_series_telegram_channel.pdfIn PDF document text
    • http://vulupexemuv.iblogger.org/5464289770.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/Djjhehj/tiwogenu.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/shjjdto/66241375153.pdfIn PDF document text
    • http://carbags.site/talolegexudunafeladu72ide.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/jESgfge/rosugofodewow.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/mVTjdig/general_knowledge_quiz_fun_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/gjtegfJ/85538429892.pdfIn PDF document text
    • http://ru-1.casa/superhero_wallpaper_hd_download_for_android_mobiletkjvs.pdfIn PDF document text
    • http://jetavimazi.22web.org/romanticism_philosophy.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/jfJhio3/baby_shark_ukulele_world_record.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://govujetimavex.epizy.com/spring_boot_jdbctemplate_example_mysql.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/79021184865.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_e8e9708c9f64474bb76824521463dd63.pdf?index=trueIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_537aea87c35e427da06152322c902f21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/winumigutam/file_folder_organizer_template.pdfIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_0a4e5994912743f69d9585b273aaec0f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 5664 bytes
SHA-256: 3e5fd72dd85c15c8d1c50f81964a4b823a9d9554875a5116e7279cd77f343c2b
font_01_sfnt_off00010c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 11680 bytes
SHA-256: 32b14e34a9b0d1323f7f04751d3851ba15485fd67cf4847a89b36cad2fa82238

Open this report in the interactive analyzer, or submit your own file for analysis.