Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4d615dce69a2a1…

MALICIOUS

PDF

73.5 KB Created: 2021-09-20 20:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b4413f10ce67c7c42299062fc9389fcd SHA-1: f7ca769dd1e837bfebdc64c56abdb934a3ea6ab1 SHA-256: 3f4d615dce69a2a157274b818a1cc6c162eb9dbdd0e702c184014b2aedb60aa9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The `wkhtmltopdf` authoring application is noted, but no specific scripts were extracted to detail further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://medvor.ru/uplcv?utm_term=among+us+android+free+skins PDF link annotation
    • http://nguyenxuanhuong.com/upload/files/kexelezoxurozivivezalaw.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/17126162877.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/mowuwizawinivi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161339c2170df3---kenujupoxubofupenawixo.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/9840238646.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090907175373499.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161341896cb3df---77052607922.pdfIn PDF document text
    • https://photojet.net/userfiles/file/kefedasifapigogegalev.pdfIn PDF document text
    • http://letdentalab.com/img/files/zijaderiwutix.pdfIn PDF document text
    • http://tercovci.cz/files/file/kixegizivosovenibaxixufap.pdfIn PDF document text
    • http://unsersohn.ch/images/file/48909134534.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/kovexipejinezin.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/jolujerunoguxo.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/nojojabufadalajuka.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/xagowasojalinepupudol.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/44771820691.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/tatujagolan.pdfIn PDF document text
    • https://designclarf.it/file/gulifivege.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/ravomeraloveri.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/refego.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/kugugagir.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/61392346538.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_off0000bdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 16556 bytes
SHA-256: f0a46ebd8e01e8eb9e09437748fd29b8942e102de70aea26e3d1c72555ca7bec
font_02_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 10728 bytes
SHA-256: d95ad1ef5d4acd819e8df658d59fe2d8f0281d5b2f65754c38e6ecbde41c63b6

Open this report in the interactive analyzer, or submit your own file for analysis.