Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3b4efc98fe1423…

MALICIOUS

PDF

72.6 KB Created: 2021-09-11 08:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8d7d892913e52863c4d108ef59d6e37 SHA-1: ecc3bd004a7025128003a6e41941478d201d8c7a SHA-256: 8c3b4efc98fe14230af13ca512723a63fed0545f3e7ae237bd04306c7025452a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links pointing to various domains, many of which appear to be disposable or used for hosting files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=watch+rupaul%27s+drag+race+season+13+episode+2+online
    • http://erpos.sk/data/files/96945801332.pdf
    • https://aldwalia.com/userfiles/files/nalapelomasudobixafuvipev.pdf
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/19187733353.pdf
    • http://innotack.com/userfiles/files/jilagiwekelapikovomobur.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/07930bb8cc24b3929dc23d72468527fc/tamebufejafotipamezevupe.pdf
    • http://pnktools-th.org/ckfinder/userfiles/files/gapuvorawisoparovalidu.pdf
    • http://vitalbafitnessclub.eu/userfiles/files/kamedukafinunifoxixobe.pdf
    • https://ikansambel.com/contents/files/vogaburisarolupiraxejanev.pdf
    • http://vetusmeter.com/images/upload/File/14538213384.pdf
    • http://salamino.pl/userfiles/file/xitagusamusubabok.pdf
    • https://maffart-guy.com/userfiles/file/jiveguzeposefigukuvove.pdf
    • http://apsons.eu/files/file/gogifile.pdf
    • http://ajivikafinance.com/userfiles/file/walutawadile.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210902145254.pdf
    • http://asesoriazabalburu.org/azaba/files/file/37926056410.pdf
    • http://bigcool.net/webroot/img/files/digozosemubarurifubu.pdf
    • http://dxline.eu/userfiles/file/nekekuwewusevudoz.pdf
    • http://www.prakashirrigation.com/uploads/fck/files/72794927344.pdf
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/movinaxaxozir.pdf
    • http://sgyscom.com/upload_fck/file/2021-9-3/20210903124450522631.pdf
    • http://thevisionkharj.com/userfiles/files/18431908458.pdf
    • http://taperagi.com/contents/files/tipusaxulekusosojadi.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/76aa49ae642624e8815a13fb8ada654f/79571982110.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b616.bin
27510ff91070eb17fd70c275dd85d2c3939b2dbdfc379d74b8832471b120fb66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB616 11264 bytes
font_01_sfnt_off0000d073.bin
4deb0169ee21341c10c613d6bd6032325592e10841591d51948ba987eff50259		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD073 17012 bytes
font_02_sfnt_off0000fc80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 16792 bytes

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