Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8f916db533e5c0…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 19:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8eba474bfa98567fca25213a7997ea45 SHA-1: aef6a743380838cda0578379335cbf091583adcc SHA-256: fc8f916db533e5c0a98e707cc5b8ac1ca6d92cace3031c20de3b9652c92dfeeb
134 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to potentially malicious or phishing sites, and ClamAV detection confirms its malicious nature. The embedded JavaScript likely attempts to exploit vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef0da1cc2a---jibiniragumonewazar.pdf In PDF document text
    • http://studiopignotti.it/userfiles/files/bisejorogofezuvebovuzifum.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/84995157992.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/56345518656.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/zujuxamaxinexelokojimanu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161352c3fce466---18498493472.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/67818901938.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/35835622957.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/47079753336.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/lipudixojopun.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/wesibewi.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/1954522975.pdfIn PDF document text
    • https://linardi.ru/files/file/pusupazapurexuxupos.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/kopimuxa.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/66385680750.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/lokiviwubewupoguwenejibiv.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/53735856280.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/11246689332.pdfIn PDF document text
    • http://sireny.net/share/files/48761738367.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/2835359550.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/12525351198.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/fesewuputukononamamesuvu.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/41550841144.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/89581176042.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/besajukusidomelenapifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+illegal+streaming+sites+sportsPDF 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_off0000b3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F8 16276 bytes
SHA-256: 0b3bc14d93054da6cbfa1d56b6068c2c934d9792e64522fabac110739522cf0d
font_01_sfnt_off0000dd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 10648 bytes
SHA-256: 4b70c8802f5d732a1f59d56e140cdde33a5f66ec932fcec5b392ab3b23b5d174