Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ac49cf1a633282…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 12:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e93cc657df6b9ad3505bf396cf9aedb3 SHA-1: 7ee371b00c7710191cbe0146d637f2c50e56d7c4 SHA-256: 53ac49cf1a633282fd96549b7a877b2ec3631765bb3916b1d135367d8b35079e
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://dobski.pl/userfiles/file/mezelokig.pdf In PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/maxevikutuxil.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/26377910566.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/279544552.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/34759674010.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/82573669893.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613684f0380f1---21804222670.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/18158919430.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210903064437.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/lifogeze.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/lipeja.pdfIn PDF document text
    • http://sparkpro.lv/content/file/76688883471.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/94276952787.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/tozumanupavoxekuzeg.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109041748362012.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/20984963433.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/2793346523.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/puxeku.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/35389774320.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/52036632359.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/kilaroziruge.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/87654822713.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/kawamuporavedujezofu.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/fizovusobapujepofanoso.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161361ccae2f2a---40913527109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=move+contacts+from+androidPDF 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_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 10652 bytes
SHA-256: 24dc5d5173875139518dbf8f8b0bbdfb6d94ba656ce8e15140e2013b2cbded7f
font_01_sfnt_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 18280 bytes
SHA-256: 1b67842bde1fb70d9a79ae39015eb88fd56e358ed56dc61fd20467baa07442f7