Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6c501f9f18b069…

MALICIOUS

PDF

77.1 KB Created: 2021-04-21 09:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acbfd3409cb4e17d45808cfd3e7a7563 SHA-1: cf0c8fe792e2c2d67680372bd58155c6b30121ee SHA-256: 9f6c501f9f18b069078540ce1b5949fab1373189423d41189de7e5b8e21f222a
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure, indicating a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+are+the+best+science+fair+projects+for+6th+grade
    • http://reestr.site/fatajudus5bvg1.pdf
    • https://cdn.sqhk.co/kosadara/rjhvHhg/92494708591.pdf
    • http://wuwodijutorem.iblogger.org/21877406559.pdf
    • http://startask.ru/kuxekov2017u.pdf
    • http://vogeposekuxav.66ghz.com/dumenegunurewenipe.pdf
    • https://cdn.sqhk.co/bamikalagov/gd86pa6/daily_behavior_checklist_for_autistic_students.pdf
    • http://natnat.fun/they_say_i_say_chapter_3_exercises1wicz.pdf
    • http://erogan-oficial.site/kiran_kiran_soorajrd4n0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kuwexugebukutim.rf.gd/tapezujuzukadagasa.pdf
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_a620e4ef72a74a1ca893016149caf1ce.pdf?index=true
    • https://5de9ed01-d610-4143-94db-6f998645a8ce.filesusr.com/ugd/1d8bf6_9ec0ded1442e43c59cba393942667508.pdf?index=true
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_ba7c9c246d2b4230b6608449f48d73ff.pdf?index=true
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_10e339ad8724420da1881c7d5a6d7cb6.pdf?index=true
    • https://s3.amazonaws.com/rirusozo/55642396505.pdf
    • https://s3.amazonaws.com/lixuduwonifa/how_to_re-pair_summer_infant_panorama_monitor.pdf
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_924d6fc9e89346a2bd9c638356d966ab.pdf?index=true
    • https://s3.amazonaws.com/xovekolamoxe/how_much_do_reiki_classes_cost.pdf
    • https://s3.amazonaws.com/tobito/first_nursing_job_interview_questions_and_answers.pdf
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_48d9a761aca54852b94790b6e2e016d4.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_off0000ef8a.bin
229f3b164ede1148cd6d939ca8b1c04585499d08c843886147c9bd34183c9e86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 5768 bytes
font_01_sfnt_off00010338.bin
f6bfdf13ebe38d4f4c0a704da95f0fcc43a2b1b2283f0c1b11e874a068301e3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 10572 bytes

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