Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c84a6c100b24272…

MALICIOUS

PDF

76.7 KB Created: 2021-03-29 10:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4591ccd1ae66e14be36bd27b6be58445 SHA-1: 7f92f35ef74cb4193cd28774966a6c987623c4e2 SHA-256: 7c84a6c100b242723d9e585af59180287fa5a734469ec33f06103a8daf91aea9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to suspicious domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to contain metadata related to PDF generation and potentially deceptive content, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/award?keyword=act+math+syllabus+pdf
    • http://auto-agents.space/messenger_video_call_and_chat_freed0xdg.pdf
    • https://static.s123-cdn-static.com/uploads/4407989/normal_5fe295963ed05.pdf
    • https://cdn.sqhk.co/soxosovave/XRzijoa/reckless_getaway_1.pdf
    • https://cdn.sqhk.co/kogeledewafo/1jgRodX/tuzugofemope.pdf
    • http://fanelafimud.22web.org/corazon_de_nio_partitura.pdf
    • http://pafewubeb.iblogger.org/introductory_statistical_mechanics_by_bowley_and_sanchez_solution_manual.pdf
    • https://cdn.sqhk.co/mepowokugo/VjbzFgj/come_holy_spirit_prayers_catholic.pdf
    • https://cdn-cms.f-static.net/uploads/4476590/normal_6041bb4c5bccd.pdf
    • https://cdn.sqhk.co/kidimezamos/6ggragh/54061365565.pdf
    • http://4escam-bot.online/78376172277r1nzx.pdf
    • http://mstmail.space/104918719037xp1i.pdf
    • https://cdn.sqhk.co/tevotapomow/9hcggig/superhero_maker_2._5.pdf
    • http://confirmyourverifiedbadge.com/troy_bilt_storm_2410_not_getting_gasx95yh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dobesogum/meade_telescope_service_uk.pdf
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_4fe35354d327473ea2d3b7d378f6099c.pdf?index=true
    • http://lefivagalowo.rf.gd/arithmetic_mean_file.pdf
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_7a114d1ed2c0462f9655bb98d541aebd.pdf?index=true
    • https://s3.amazonaws.com/kujesulad/21662813344.pdf
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_95be4aa6a2e945cdb8a6f1b74e83834e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4e.bin
906083d4753410b6d7d4e44f67c03a8d4a6186a90f8b05434f777e0c32d61c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 5528 bytes
font_01_sfnt_off000100fa.bin
bae6c635a2af0bd3ddcab3bccd9a23d0ccce51da819fdc99fc6597810299b4c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 10892 bytes

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