Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31a45e470869d2e…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 01:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a6206001aa4b4fe313f5ee6469fdd4e8 SHA-1: 7a2f5a62cef5c099b119c2c93b7fce7bca5f1b94 SHA-256: a31a45e470869d2e72a882952fc48342ed1cd0bbbe36892988891cf398cb26cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure itself is used to host and present these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://studiobaliva.eu/userfiles/files/lesowuvibefubo.pdf In PDF document text
    • http://theonejsc.com/userfiles/file/vajebufuki.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/93569671260.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/27426755791.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/kixax.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161378fc5ad3ff---81703228457.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/xukigidutopajavulafapa.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/befiluparujunudovu.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/58816634730.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/59952737722.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/14579382496.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/binifajejuzefawak.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/73892663942.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/kobimatapuzifibudigabi.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/56837763441.pdfIn PDF document text
    • http://imoroz.by/upload/file/vigafopasuxogaluwojale.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142168f6a01a---bolobaxoboxajubedaw.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/7927283483.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/90790201751.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/gupenudulaxixola.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/89261316162.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/ratanovunaniv.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/gitijogopaza.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/xokisuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=shortly+ai+apkPDF 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_off0000b472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB472 17868 bytes
SHA-256: 8df3f0a9e7a6ed419475de0c02678e9aad1c3996fe9b11ba9f2bf224275bd417
font_01_sfnt_off0000e1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F7 10224 bytes
SHA-256: 9f0f7bd20ef2154811cd3ac6f46cd60ee2ace7b60da4c573149e1af6b67354f3
font_02_sfnt_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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