Malicious PDF — malware analysis report

Static analysis result for SHA-256 8293b89b20f57bc2…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 12:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 7b92e80701f57c50cf5eef7a4126defc SHA-1: e38d189f1ea42e809ee6b8e43ffa8650cef640d4 SHA-256: 8293b89b20f57bc2af76b390164900c3ed07eff435f5ddc8fbe556209063a079
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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://infrive.ru/uplcv?utm_term=bahaya+merokok+bagi+kesehatan+pdf PDF link annotation
    • http://wonsakai.com/uploads/files/17477672891.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/rupuranesotax.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/fesadezelowusedevib.pdfIn PDF document text
    • http://wohingltd.com/userfiles/xulavup.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/nibaduwidajevig.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/20117859582.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/zomawonesetovuwir.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/datiwotijazedazev.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/tamelutamev.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210905100650.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/52030496586.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/xipebulasaf.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/nenef.pdfIn PDF document text
    • https://tdfstore.it/file/69809404192.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/falazad.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-1/20210901213111559142.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/87896372732.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109061828229528.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/mevotalubudib.pdfIn PDF document text
    • http://alkanboya.com/files/file///60611376625.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354d846d797---loxil.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd17c7704a---tarakegijoweli.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/pomoredevezumebewaxuk.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/sopafexotobavi.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/senalozibinuxa.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_off0000e685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 11300 bytes
SHA-256: f8f3c88cba1e3d4ca20b83a0f45cd6c12653faacabc10a76c126c5bf8ece6c67
font_01_sfnt_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 16416 bytes
SHA-256: caef6a0533444703972fdfb1500b796c3a4f9eed6c9d5d55d35f4078b2152749
font_02_sfnt_off00012b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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