Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fc6bed7e0d8b7d…

MALICIOUS

PDF

79.2 KB Created: 2021-09-09 22:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab8ddf6f98f5b58912d537d0d3b3a064 SHA-1: 3cef9c4c177f35f37108eae201c8e906b26b9dc6 SHA-256: 16fc6bed7e0d8b7d228fb0982eecfeae3aba4be3a1b631de22900bd7e8716b3c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using many disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://loonbedrijfschimmel.nl/userfiles/files/pedixidajomafiwosa.pdf In PDF document text
    • https://vilus.cz/userfiles/file/vewemumevigolelovipixagel.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/xupusavunuw.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/rawixutubuxokugagitok.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/lewopivipoge.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa64ddbcef---luwepegigategazux.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/11023722508.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/gavalaruvepaputosaton.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/76920373368.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/kalagudenafez.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/gopumirarivawojiko.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/74325092420.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/59610131725.pdfIn PDF document text
    • http://farashimirooz.com/files/nedoganumibijuxufik.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/sibovivuk.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/sasixobonot.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/7541723169.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/22964944444.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/zurapusuzarokabekuxomevu.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/nomofixodubotefe.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/nonutilevutipagi.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/gefogofagoberoset.pdfIn PDF document text
    • http://ore-processing.ru/d/files/zowuziwokapolunidinoxeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=programming+wpf+pdfPDF link annotation
    • 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_off0000d0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FB 18084 bytes
SHA-256: 1c6cf9e8e5aff4f21f0fd3a90dd34b3515a9532698dbcf2998b1c7d486f064ed
font_01_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 10484 bytes
SHA-256: 47f99e5b618a91dbb57d79c8f21829b1904167e4734ffbe771aae4ea65945b94
font_02_sfnt_off00011782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1