Malicious PDF — malware analysis report

Static analysis result for SHA-256 566552546c7df2eb…

MALICIOUS

PDF

77.4 KB Created: 2021-03-30 21:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 976c957f079511d93d8e5b6bac6decd6 SHA-1: e717a05fc7041df6f9cdbe3f64191e68dc973675 SHA-256: 566552546c7df2eb0e6333740297292fb73fec55d77dd2281056b38dfbd206d9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crophysi.ru/123?utm_term=careless+whisper+piano+sheet+music+easy
    • http://xilavinem.medianewsonline.com/psychology_studies_in_tamil.pdf
    • https://tenekivosorudo.weebly.com/uploads/1/3/4/5/134596066/zoxopitir.pdf
    • https://lebamemodeli.weebly.com/uploads/1/3/0/7/130776101/zuxufupuliw.pdf
    • http://gixapedotamerow.mywebcommunity.org/85731567853.pdf
    • https://cdn-cms.f-static.net/uploads/4419650/normal_6056116c1ff65.pdf
    • http://organize.shop/un_monstruo_viene_a_verme_libro2qot6.pdf
    • http://uptodate.site/57834171874o200p.pdf
    • https://lobogisotu.weebly.com/uploads/1/3/4/8/134870795/d8b231.pdf
    • http://1xbet-registrat.site/lumix_fz70_vs_fz80yc67w.pdf
    • http://tugeraz.22web.org/aa_tradition_5_checklist.pdf
    • https://wawedubogefolik.weebly.com/uploads/1/3/5/3/135391715/9a927.pdf
    • https://cdn-cms.f-static.net/uploads/4471960/normal_6041ef7483292.pdf
    • https://cdn-cms.f-static.net/uploads/4485801/normal_6037c7f484e0b.pdf
    • https://cdn-cms.f-static.net/uploads/4457573/normal_605161a29348a.pdf
    • http://modernstyle.pro/fgdp_radiography_guidelines_referencejcopp.pdf
    • http://xedeporib.medianewsonline.com/xidizemoxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://givaneja.rf.gd/the_chocolate_war_plot_summary.pdf
    • http://pirarotuweze.rf.gd/how_to_become_an_educational_psychologist.pdf
    • http://rapuwovire.rf.gd/40295505790.pdf
    • http://juvofirodeburu.epizy.com/42507357694.pdf
    • http://punotonaduwize.atwebpages.com/apple_time_capsule_setup_file_server.pdf
    • http://josuxak.atwebpages.com/overture_to_candide_flute.pdf
    • 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_off0000f1f2.bin
894f5c41aab00675d8f8ab95259203d642e7e231a1c067758820cfc7a58f970c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 5272 bytes
font_01_sfnt_off000103c8.bin
a7b4884d235be899bc9dc6e2a297097dca3f0acef234709b07da29c7128d957d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 10540 bytes

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