Malicious PDF — malware analysis report

Static analysis result for SHA-256 b932ac55398b8c55…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 13:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6913e05da1a362629d9e1d55d1c0e7ed SHA-1: 88532be57afe80db28d64744904c995d4e27a2e4 SHA-256: b932ac55398b8c55b31c5f25e18e1f22612e57991566cf739a52c106d4aa299e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with several pointing to suspicious domains and one identified as a random URL. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded links suggests an attempt to redirect the user to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://renfrewareahealthvillage.ca/ckfinder/userfiles/files/litabigesojogu.pdf In PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/52662755899.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/xewape.pdfIn PDF document text
    • http://orem.mn/uploads/files/newagezifitix.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/57217465501.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/lexebore.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/tiwesaterulukobuvuk.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/87989604337.pdfIn PDF document text
    • https://2winit.com/Files/files/suxilubumigititelox.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-07/images/files/nojumutewejusupidawu.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/93893742583.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219915971250.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/sojufozilotarefulovetij.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/95114469372.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/kefefumep.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/83555207908.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/xobimadizaminelunonudile.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ead234ffe7---towurapufax.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/892983995.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/kufaxaputodezozasutigupeb.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/98156248591.pdfIn PDF document text
    • http://wjcopy.com/upload/files/sibiwisafun.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613873ea63f5a---rolulibup.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/98426993028.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/viwezujukemegikukumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=a+simple+android+application+codePDF 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_off0000cc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2C 18992 bytes
SHA-256: 3f9b99af8b90c403c40550d6fdbdc9ef7819676ebd7553b4df25cba0274706b5
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F9 10656 bytes
SHA-256: b0a46699ab0773d43a0f720327155eba3690f15bdbb13f3eab6d056c0b643850