Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f36a482fb185c2…

MALICIOUS

PDF

72.3 KB Created: 2021-09-22 09:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a258cd7d8a80c1a8606c84b1bcc00108 SHA-1: cc0f52365e6b7da37d7e3a60955615570fc2b1c6 SHA-256: b6f36a482fb185c26a798734066752e71516ca2941ebc157ccee26212480fc62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://everywheregenes.com/uploadfile/qu26_qu106_com/files/xubef.pdf
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/wopizirikogabexejo.pdf
    • http://dancephoto.ru/userfiles/files/bufemudenesave.pdf
    • https://rimi.sk/userfiles/file/vimenozikekaduguxuxijow.pdf
    • https://lyonsinn.com/nbloom/fckuploads/file/46668738100.pdf
    • http://kahasat.cz/data/file/3486201401.pdf
    • http://ct-tci.com/cttax/userfiles/files/xudabefazalo.pdf
    • http://zamgph.com/uploads/file/190421194666.pdf
    • https://doan295doson.vn/namthuan/images/news/files/94350736678.pdf
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/55680285487.pdf
    • http://micronforgacsolo.hu/UserFiles/file/tosasalorotuxebun.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8a27e35q9tc6i7gf555vnqrcv1/87547018570.pdf
    • http://chamdure.com/DATA/files/84744212504.pdf
    • https://digiconelectronics.com/media/gavodafuwi.pdf
    • http://chi-kara.net/userfiles/file/tofunasemebusenagu.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613343c842873---21843776521.pdf
    • http://hotelclinton.it/userfiles/files/2688086938.pdf
    • http://www.florentmaussion.net/userfiles/File/28491139994.pdf
    • http://lorichphoto.com/pictures/file/defakepizemaganitiwapebir.pdf
    • http://hichipper.com/hichipper/uploadfile/file/2021090916470173499.pdf
    • http://doanekeyes.com/userfiles/docs/fisojoj.pdf
    • http://www.cddfct.com/up_files/file/27174027350.pdf
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/81563228931.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=differentiate+between+prokaryotic+and+eukaryotic+cell+in+tabular+form
    • 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_off0000b681.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB681 16792 bytes
font_01_sfnt_off0000ce93.bin
d4d72ac2bf7d0e226713fbd2b27fb9a962d4ff87e12cbcfe25bfb43d7c64ccb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE93 16652 bytes
font_02_sfnt_off0000f97b.bin
b40838e19f9cc3b736e9765be32c9edff3612a27849f4236bac76c92908bfce3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 11144 bytes

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