Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c24f2761e81cc8e…

MALICIOUS

PDF

77.2 KB Created: 2021-09-24 00:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 793ac14fce089f79e6f3585293414fad SHA-1: 3e001df71e559c7ab437403b5b9ee049667b6cbb SHA-256: 8c24f2761e81cc8e9d64597918e3987c5a6fe6abd4f10add8409c6ae8f540845
134 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. The high number of external URIs, many pointing to disposable domains, suggests a phishing or redirection campaign. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=copilot+for+android+review PDF link annotation
    • http://tasfor.com/files/galeria/files/wekefisigebiwigabix.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/giwudugufuma.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/belupidiwagadukuxatepeg.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/voxefuket.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/lesapabegoraron.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/ruvezele.pdfIn PDF document text
    • http://aktifmedya.com/dosyalar/files/8957202473.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/mobonoxitigakalunopetivuw.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/54504233420.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/guvaget.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/lusixiwakutilixog.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/mudusopexodeza.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/25793384413.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/xugekonuluf.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rizolerowodibizonusijipi.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/mobujisaxetajezasek.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/61092149281.pdfIn PDF document text
    • http://citlak.de/admin/UserFiles/file/54063803037.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/difofirodaxeratiwok.pdfIn PDF document text
    • https://yifff.se/userfiles/file/wisekapelogon.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614c27514d240---94098516668.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/84306257346.pdfIn PDF document text
    • http://ellev.fr/upload/files/75627735507.pdfIn PDF document text
    • http://fourfoods.com/images/files/21464949347.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///15859717354.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/61435832833.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_off0000c6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E3 10508 bytes
SHA-256: fd1969d2fcd69e47b309e16711f12b5813ff68c0bec840267b55ce5abd4865d7
font_01_sfnt_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 18264 bytes
SHA-256: 3220d75d7391073a3864f9754871a4dd549ac4de988f355bf64665c40662baa4
font_02_sfnt_off00010f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1