Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb405eb2aeec2d93…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 20:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48631eb65a2fd537c3a96dc5514f144b SHA-1: 8339584b7fc536b6af70070f222fb7a10a1aba40 SHA-256: bb405eb2aeec2d93e57936fcebcf7debdb95d02e82a62f45777a1078b4fb5acb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, suggesting an attempt to redirect users to potentially malicious sites. Although no scripts were explicitly extracted, the PDF structure and the presence of many external links point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.igescanada.com/ckfinder/userfiles/files/79554180723.pdf In PDF document text
    • https://gres-k.cat/userfiles/file/nepuko.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210914_7F51346A9547F046.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/rapexogajamuson.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/11275004222.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/62640003689.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/luturala.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/xurojozovebi.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/98830774693.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/96895612569.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/66091166006.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/92744953748.pdfIn PDF document text
    • http://sciattella.net/images/file/87886794233.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/88610440218.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae03cebb78---35714601280.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/83370994411.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/tizonekebebifuko.pdfIn PDF document text
    • https://anup.bo/images/files/49017313805.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/55083803841.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/kagut.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109192105234827.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/fenidorazewerisewoso.pdfIn PDF document text
    • http://benrassam.com/uploads/files/gedoxeviferat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=k+means+mapreducePDF 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_off0000b20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20F 15652 bytes
SHA-256: e3bdf240cf7d0238a56e799bc698d721fbadccc32144cfe4b4afd1956eff3bd3
font_01_sfnt_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 10408 bytes
SHA-256: a958d87ac4bacaa7b59d3f39459d605c0776125bca3777ca5b1bc8ced8fb6e53