Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69dded52261cccc…

MALICIOUS

PDF

83.2 KB Created: 2021-09-15 13:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db3045bf8692559d2f39e79b3bcf969b SHA-1: 3153a2429d99efda82c424fa754e273e07ce27ad SHA-256: d69dded52261cccc9456627361672c9d0b6c60273c27e3443f9ab90e9ee03d26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high number of links on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly suggest this PDF is used to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 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://pixomot.ru/uplcv?utm_term=mensajes+subliminales+android PDF link annotation
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/wetajonisojexola.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/nitixif.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/segevadunexumutut.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/nerifibefuvagoxifisogo.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/bapok.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/34690026941.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/wizotadebuv.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/wizutajet.pdfIn PDF document text
    • http://steinemann-ag.ru/faruviviretefiliduluv.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/jutuxodekiwo.pdfIn PDF document text
    • http://naso10.com/userData/board/file/lorubi.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/25931936277.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/21726736359.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/23102365647.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/93182968490.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/wamot.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/4705514155.pdfIn PDF document text
    • http://okun.su/upload/file/fanofire.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/galutizopufidegefumuluku.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/topiperesokufosirolus.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/19775172713.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16140f5544191b---65808443374.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/lezolewademopejebawutazo.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1630555832.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/fnjdrmfi3q76g99filhoa0ha56/77299889335.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tebugosigawufofaju.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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 19040 bytes
SHA-256: a2dfda6e3eb593b04300fb5c7899157926dc0e198cc5ffad4d7d772e1a8f9815
font_01_sfnt_off00010ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE3 10676 bytes
SHA-256: 3e31ee51ef51700f888d6ef68ab71f52350296fcbf6b789cddf03064cd4be3e0
font_02_sfnt_off0001273c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1