Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99b7dc40c7576ae…

MALICIOUS

PDF

88.8 KB Created: 2021-06-08 17:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2201ebbecf183e12423a3a850f39a198 SHA-1: 331eccb9486016d2ee09c173f18e0b397ddf2121 SHA-256: b99b7dc40c7576aec46b5a3ef349a6d94fa730d2e542dfd3506f1485e168e42f
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive link farm point towards a downloader or phishing lure, likely using embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/123?utm_term=classroom+commands+vocabulary+worksheets+pdf PDF link annotation
    • https://telutowi.weebly.com/uploads/1/3/4/9/134904764/zopejuforagikugikuf.pdfIn PDF document text
    • https://dumerozum.weebly.com/uploads/1/3/4/6/134611270/muwafaliwafimes-tazepa-zujefifirevi.pdfIn PDF document text
    • https://ziwopigop.weebly.com/uploads/1/3/4/3/134380455/e82401b4b08c.pdfIn PDF document text
    • https://naruvoraxosu.weebly.com/uploads/1/3/0/8/130873998/15b5ad.pdfIn PDF document text
    • https://pijefezumiw.weebly.com/uploads/1/3/1/3/131379255/ec75fd3483a.pdfIn PDF document text
    • https://kigukudisan.weebly.com/uploads/1/3/5/3/135321724/niwapovuxulute.pdfIn PDF document text
    • https://xuloxaxofe.weebly.com/uploads/1/3/5/2/135294954/wimuzozeni-nuruzideku.pdfIn PDF document text
    • https://papobujiwirila.weebly.com/uploads/1/3/1/4/131453114/pazegifutezorufi.pdfIn PDF document text
    • https://wozijosetat.weebly.com/uploads/1/3/1/4/131407158/6652071.pdfIn PDF document text
    • https://zuxufigosod.weebly.com/uploads/1/3/4/3/134309968/luduzu_xatepezek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suniger.pbworks.com/f/rapabi.pdfIn PDF document text
    • http://wipadewor.pbworks.com/w/file/fetch/144803757/sleigh_ride_violin_sheet_music.pdfIn PDF document text
    • http://pukagij.pbworks.com/f/ejercicios_formulacion_alcanos_alquenos_alquinos.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/how_do_you_find_amber_alerts.pdfIn PDF document text
    • http://xotokuwawa.pbworks.com/f/descargar_discografia_completa_del_binomio_de_oro_gratis.pdfIn PDF document text
    • http://ririgifavem.pbworks.com/f/how_to_control_your_self_discipline.pdfIn PDF document text
    • http://zeratuwolima.pbworks.com/w/file/fetch/144647763/how_to_read_conners_rating_scale.pdfIn PDF document text
    • http://misabovu.pbworks.com/f/manual_dos_padrinhos_marsala_download_gratis.pdfIn PDF document text
    • http://gazumadu.pbworks.com/w/file/fetch/144468849/57487162247.pdfIn PDF document text
    • http://bovozajezo.pbworks.com/w/file/fetch/144467058/xijuvanalidoxusixuf.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/f/the_peripheral_route_to_persuasion_quizlet.pdfIn PDF document text
    • http://veposasidot.pbworks.com/w/file/fetch/144786834/how_to_cite_a_textbook_apa.pdfIn 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_off00011c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7C 5760 bytes
SHA-256: f25308bf82d51ff1b69a6e35d1de735fdeb657846eeed5f1596521e3ea8818d1
font_01_sfnt_off00012ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFC 10996 bytes
SHA-256: de86642fdd94cd791c02eed6c694e8ae7b21281fdc6cb41263bfcc008da50c5e