Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b72efa8c488d31…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 17:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c9a5c56f99b6ccdacdca7c133d0e25f2 SHA-1: cf25e6b7f30452f21b29dd97aa0366010c8836bb SHA-256: b9b72efa8c488d31b6511369e3f38a362e900eaa9b0b7c709264c27d2f9cf282
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate an attempt to redirect users to malicious sites.

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://philabc.ru/uplcv?utm_term=how+to+install+android+studio+on+windows+7 PDF link annotation
    • http://kme-kme.cz/files/file/suselusetimegepilodefej.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/2714275417.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/33803743134.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/27076596550.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/62376459376.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/fuboligasaxafativate.pdfIn PDF document text
    • http://glttek.com/userfiles/file/31376848361.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/85841224752.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/61429410043.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/50024455748.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/66128975685.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/16702519604.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/73382197327.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/7080636234.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/16815158674.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/jusifikotesabigubetepixam.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/24370939155.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/45574388403.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/77448080778.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/99317983746.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/wisoworemi.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/18326647956.pdfIn PDF document text
    • https://duvanco.be/docs/files/12310567480.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/mositerikuwapofugenevan.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/vujuluget.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_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 18384 bytes
SHA-256: ec1c239029799dae74e7772e3311f85245b6d8b27ee538a7112d731360e169c0
font_01_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 10336 bytes
SHA-256: 0776fd2e1ec4a76c16ada8c1ab6897d51e2dbab47eb47a079a0a87689ff946a0
font_02_sfnt_off00011ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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