Malicious PDF — malware analysis report

Static analysis result for SHA-256 f293d028fbefaa85…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 22:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 15a5084c5c2dc475d71d40b14c25ef73 SHA-1: 01fa1e7a239a6d21e302cb23e54d1a809062d98e SHA-256: f293d028fbefaa85e7c891719e59dfe57bacfe28a74ca84b3dab2166dc13af6c
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to the external URL 'https://drafthe.ru/uplcv?utm_term=advanced+webview+android+studio', which is hosted on disposable infrastructure and appears to be part of a link farm. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://drafthe.ru/uplcv?utm_term=advanced+webview+android+studio PDF link annotation
    • http://deborahkay.com/ckfinder/userfiles/files/vutibem.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/1305779571.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/26353934876.pdfIn PDF document text
    • http://briztravel.com/upload/files/sibujivaxika.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/10873435971.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/mosigagiroladix.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/51807982091.pdfIn PDF document text
    • http://palami.by/images/file/6732824073.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/vugikotigudup.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/zakopo.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/kesifozawuxes.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/javibojutapadaxolubaw.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/zenajobu.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/vavidenajademunutavubimin.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/44356394263.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/9984001668.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/lemefog.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/vamalifu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abc2769bc4---wobudowaxipetojogupekuf.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/15750611788.pdfIn PDF document text
    • http://podarox.ru/public/files/bexeg.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/23788366509.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_off0000c6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CC 17580 bytes
SHA-256: ffd51732eeb91975e986a32c3f1998062ec2d93d0fe420362cf7b237a2a4b5bb
font_01_sfnt_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC8 10688 bytes
SHA-256: 460fcb88542a226e717eab4c4eaf4e71028865c33d7f16b58cb856035d438211

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