Malicious PDF — malware analysis report

Static analysis result for SHA-256 b077a4f147a37cf3…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 10:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e380407b56ef8a8a64b1baa99551e1f SHA-1: 465fa5ca5b8f2c6170a29f24846a46d88733dff5 SHA-256: b077a4f147a37cf3af0bdc8a1bfd56823fd0c318b0af04bc5f44b4c54ea9f35c
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a social engineering lure to install browser extensions or updates. This suggests an attempt to compromise the user's system, likely for credential theft or further malware deployment. The presence of embedded JavaScript points towards its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://pixomot.ru/uplcv?utm_term=using+however+at+the+beginning+of+a+sentence PDF link annotation
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/pexejiriluruk.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/73643044100.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/92182605431.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/54639953677.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94c48b860---98505723419.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/40276597588.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/bumajusasemana.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/xiluwipubogepawikopep.pdfIn PDF document text
    • http://movediary.com/userfiles/file/mitixomerezamijajokux.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/xemetemugezixapuwo.pdfIn PDF document text
    • https://ismart99.net/upload/files/4658604159.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/mepedomijirosowaf.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/wojab.pdfIn PDF document text
    • http://maxbrio.kr/files/files/xamojopunoxakisevu.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/vobidiwosawi.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/34913318838.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/85179045905.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e963f51f6f28351711570abb97f0c7d8/7913768160.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/30681624354.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/tovarupatefuxad.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/94980990129.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/19664381304.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_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 10868 bytes
SHA-256: 33d9fcca73e26eceb5c1b29ee472d7eeff0006505614fb67206aa85d7ffa3139
font_01_sfnt_off00010032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10032 17684 bytes
SHA-256: 839544ee6677a672408a47d63c848f19ee493d484393b479183fa8a29f90a8a5
font_02_sfnt_off00012e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1