Malicious PDF — malware analysis report

Static analysis result for SHA-256 64dd6aa320f49944…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 10:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b21b98ef3e6d4638b5817070df04edae SHA-1: 40cb7f7831027cb53839e02ec972ae63f307b9c5 SHA-256: 64dd6aa320f49944c5355900ee0c5bdf5313eafc75ba35c857c8df355e4683ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting it functions as a redirector or phishing lure. The PDF structure and the presence of external URIs are consistent with techniques used to deliver malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=how+to+make+gallery+app+in+android+studio PDF link annotation
    • http://www.corazondelsol.es/ckfinder/userfiles/files/14708436653.pdfIn PDF document text
    • http://excellent-art.com/userfiles/11398445930.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc7aab9c93---xitopijukelonirut.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/bamebimowajopi.pdfIn PDF document text
    • http://belv.ru/userfiles/file/kezasubedisifivipe.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/7768310885.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/29890880827.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210904131847.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/81496262029.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/weduzusunimokalirivoruzaw.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/vederavujetigaxu.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/kozegesaw.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/mexuvogegitopizo.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/rutokuzatewatosaxudul.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/gidadub.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/gigizigimunituw.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/nedimepalavupu.pdfIn PDF document text
    • http://pedraferro.com/files/files/luzinugevex.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/80766296095.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/vuvotizo.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/72234956350.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109151200284763.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/zozovixolumesepu.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_off0000b113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB113 11120 bytes
SHA-256: 42d2742107a3d545f1f18904c0b66eb8b01aa49a1c5ea91258d9f9a1c5eb7f57
font_01_sfnt_off0000cad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 16108 bytes
SHA-256: fc13aea64681b9a4ccbc9b4da113964fcd341a88f444ec249c9c453ed4af6d4e

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