Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e7b4b2581b2c3f7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 21:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 884ca4bb38b51625ffb866dcd8e4d8b0 SHA-1: 4693619d7fd10c61fc30269ca7c03c0df565b827 SHA-256: 0e7b4b2581b2c3f748c2a2e294f57342beebdf148feb0d7b83fd659475a0f164
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this being used for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the nature of the embedded links suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://istvietnam.com/rich_editor/file/26360898381.pdf In PDF document text
    • https://nabil-doukali.com/userfiles/file/83118620480.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea82e156a---87493600158.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613454ec79f61---51613799182.pdfIn PDF document text
    • http://gr-chem.com/upload/files/42429501230.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/gezog.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/mapagexovasomiwuvorilu.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090919133873302.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/gamosid.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109121828331515.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/fogunadojumikenowekiva.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/18228181272.pdfIn PDF document text
    • http://poliinc.com/upload/files/piwuneturafozerisoborazad.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/rururusadiz.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/87230508389.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/39946113970.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/rerud.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/zovavenunurupizovonol.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/78540245430.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/62213723137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+kissing+booth+2+online+watch+freePDF 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_off0000dce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 19308 bytes
SHA-256: c7e84bce4cf1abfd7d7e1e5fe78cb3df3f9add58b059e3d87c7ef6fc5346c10f
font_01_sfnt_off00010eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12706 11016 bytes
SHA-256: 5c6ef67133869095bbdf0cf92ee8d1d5f8b86f2c1e7a55ca41927a89ce180805

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