Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e92dee8a83e451…

MALICIOUS

PDF

70.9 KB Created: 2021-09-30 11:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac5f29693d9b88ce02f59293e4f417a8 SHA-1: 7e39da2e5e79b1de6cebb0ec4b22c1ba67bd2f69 SHA-256: d8e92dee8a83e451981d967ae0826b77124f09bf6859be28eca4d834cfb60973
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a large number of external URIs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or redirection attempt. The presence of JavaScript and numerous external links indicates an attempt to lure the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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 https://garglob.ru/uplcv?utm_term=why+is+ios+smoother+than+android PDF link annotation
    • http://chiari-web.com/ckfinder/optimist/files/fagaminajipuniri.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/xirutedalitijexapepe.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/xulilodofufakasotuwupazof.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210924230405.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/10478069553.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/43270110663.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/nogifopipetesumilunow.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/palanefogasojokasowod.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/79641033255.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/63414437824.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/pazofa.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/jufuropi.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/44080506527.pdfIn PDF document text
    • https://get.belonnanotservice.ga/away?/wp-content/plugins/formcraft/file-upload/server/content/files/16150af93f3203---41580505805.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/223bd155946ab0032daaa94b32e75592/nenatuluxito.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/72973983925.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/tajibov.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/60261017787.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2adba7cb259fe61f5b6042eabb9e0162/zaxeti.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/59992782878.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/54945711794.pdfIn PDF document text
    • http://poultech.net/d/files/63677797765.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_off0000b030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC842 17708 bytes
SHA-256: 7e9b0f38d94f37a79c0944c88116ea9d8a3e6db8442ecf58c3b47adcb43b3985
font_02_sfnt_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 10572 bytes
SHA-256: 8f548d6e879bedd3bb877ec1032e7f11f5af496362ed02bfc814213df45ed0ec

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