Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8931dc5408a29ee…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 01:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c37bff2c002e6bdd386a4731745b9353 SHA-1: 19b52471556183582c1b91e300f1001b961e69c7 SHA-256: e8931dc5408a29ee090cf8f732dcd0a1e0531d5adc0bbfae28769ebce51dd97c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to disposable domains, suggesting an attempt to obscure the true destination or distribute malware. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://turbotechnik24.de/userfiles/file/tetapuragan.pdf In PDF document text
    • https://e-casainteligenta.ro/userfiles/file/zoxagibazovakujikukosego.pdfIn PDF document text
    • https://ever-progress.com/upload/files/zesuguge.pdfIn PDF document text
    • http://hijoin.hu/editor_up/92589687715.pdfIn PDF document text
    • http://livestocktool.com/d/files/vojejodutovikeza.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/wamavobofusixeb.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/69198143037.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/73793842353.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/34034988944.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/vojibakadapetukurozuramo.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210902044731_tuhbm5.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/vekuwijakigul.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/42017781892.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/45734994370.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/joxojajusonupamiwofegufu.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/45105401055.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/17236903996.pdfIn PDF document text
    • https://apra.pl/files/file/dusewogutikopidaleze.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5ef5a0b79---kibafum.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/mulol.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210914094505_839615.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/57148865244.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614359f61dff7---31167181453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=yuuki+sword+namePDF 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_off0000b041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB041 17532 bytes
SHA-256: 7e695e661cd0afa30446e1e4f72e2a59d231c1c45601e2974a1ac573515a867d
font_01_sfnt_off0000dc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 10524 bytes
SHA-256: fa27c29a4b8864649ebdf23aef2e60cddd6067410ba0b637a400706601cb42e0

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