Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7eb8806829a9701…

MALICIOUS

PDF

75.0 KB Created: 2021-03-15 06:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 50b10852f79b8ea27c540991cca18c60 SHA-1: 1334c60fc90b90d3aa08d8a147504a1700dd82d7 SHA-256: b7eb8806829a970145727f164b703153693703a98aad8b86b48aa8595c5484c3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits vulnerabilities or engages in phishing. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme to distribute malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a keyword search term, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

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 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
  • 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://xezojetit.ru/award?keyword=brain+games+for+dogs+pdf PDF link annotation
    • https://lajawirefif.weebly.com/uploads/1/3/4/8/134869340/9023225.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/befc3f06c69.pdfIn PDF document text
    • https://zatofurepodato.weebly.com/uploads/1/3/1/4/131482853/58692a56cc7.pdfIn PDF document text
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/gavijasiw-rosojejelowov-besijipe-gibame.pdfIn PDF document text
    • https://lofativunami.weebly.com/uploads/1/3/4/5/134581692/66703.pdfIn PDF document text
    • https://lurufabufukigo.weebly.com/uploads/1/3/1/4/131407807/04a53b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482407/normal_6042f3714e3dc.pdfIn PDF document text
    • http://zowuzigokov.22web.org/judel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_6032f34aac967.pdfIn PDF document text
    • https://xejotonevuxujuj.weebly.com/uploads/1/3/1/3/131379732/ketesumug-lesebefosabaje-pagimomuvile-xepufizupobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pojafuda.rf.gd/free_nautical_charts_uk.pdfIn PDF document text
    • http://pumesomomibap.rf.gd/cambridge_checkpoint_english_teacher_s_resource_book_2.pdfIn PDF document text
    • http://gurisitubonofa.epizy.com/presentation_templates_keynote.pdfIn PDF document text
    • http://jonukufazok.rf.gd/89489439508.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/autodesk_autocad_2010_with_crack.pdfIn PDF document text
    • http://xafamikipu.epizy.com/southampton_maps_and_visitor_information.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/hde_ergonomic_bluetooth_mouse_manual.pdfIn PDF document text
    • http://nunemasagabegu.rf.gd/how_much_is_an_ipod_mini_worth_now.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/fidajirikemenixelizulu.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/9997733378.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/vominofosofovabeziwomuro.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 5380 bytes
SHA-256: bfeef963407f9c36997c39fcec7c54f4418182a6a97235ec5ad76805d8d8a30b