Malicious PDF — malware analysis report

Static analysis result for SHA-256 94fbade95afd7c7e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 13:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c07db69351a66f3696a5ccdc74c551e3 SHA-1: f95d768600a605dc640bf555b4e10da20b637fa9 SHA-256: 94fbade95afd7c7ea5984633e0a06b1d65262e0a485c23e22fbddbbb46be1438
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on disposable domains, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=best+free+phone+spy+app+for+android PDF link annotation
    • http://anchor-m.com/js/upload/files/8512189531.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/49254867245.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/94288292525.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/62271950790.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/75158584234.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/77606368317.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/botisisefazatibafo.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/tewotafimivowidafukote.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/68878964774.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/sififuvefepozubar.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/ditenujefejimizonuruzakab.pdfIn PDF document text
    • http://lejuriste.ru/files/file/limomubidukir.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/vujemo.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/13061529522.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210903_F8ACF3FA33719EDA.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161395bc98caed---fevupiweseb.pdfIn PDF document text
    • http://myphamasia.net/upload/files/32768487702.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/8862682089.pdfIn PDF document text
    • https://x-software.cz/data/file/95579705784.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/15709047014.pdfIn PDF document text
    • https://blv.by/upload/editor/files/61273120617.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/rawafavaramukigurubuva.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/zezoliwarasikajaxabupog.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 18284 bytes
SHA-256: f196d281cae371ba5cad679dda968e7801a5db3b4ba6cca5f21f5e169d59996d
font_01_sfnt_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 10716 bytes
SHA-256: f94867e01b8ede057f54c32f843f13f11740cdd413fd1cc0ba97cae9757ae26b
font_02_sfnt_off000124fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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