Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5221202628e484d…

MALICIOUS

PDF

68.9 KB Created: 2021-10-02 16:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e13a4e39df6dba0023f250c64c2f86da SHA-1: e78eee57057e84dc5d86592e3176a43b06895a52 SHA-256: d5221202628e484dbe03ecdd8f441d6a982681ac6994fa339cb2928c799d25c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful 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 http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dixaxid.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/99510236617.pdf
    • https://www.iieng.org/editor/ckfinder/userfiles/files/mulunamovupigokituxog.pdf
    • https://myshalewell.com/userfiles/file/pupasibum.pdf
    • https://hum639hb2-hh38.com/contents/files/63960738826.pdf
    • http://ocean-ex.com/images/blog/file/puxeraveji.pdf
    • https://myagenda.myagenda.cz/pictures/editor/files/nejukaxevisijekul.pdf
    • https://media-get.ru/userfiles/files/faxigipoviguzigitugigotu.pdf
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/pedig.pdf
    • http://lyzebrno.cz/userfiles/file/fomoxotenimoj.pdf
    • https://karlschool.org/uploads/files/202109061605092370.pdf
    • https://fallsplat.se/bildbank/file/wopume.pdf
    • https://ienter.bg/files/nigisofuluragobare.pdf
    • http://market-oborudovanie.ru/upload/file/63773518824.pdf
    • https://meganimal.pt/site/upload/file/mewinika.pdf
    • http://msinziniering.com/userfiles/file/74393126198.pdf
    • http://tg-focus.ru/userfiles/files/67567171997.pdf
    • https://ysh.my/userfiles/file/lefepopudokuxegilubovo.pdf
    • http://ji-tien.com/userfiles/file/jisezawizotonaj.pdf
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/87189236017.pdf
    • http://www.fred-robin.com/ckfinder/userfiles/files/17820674503.pdf
    • http://top1np.com/ckfinder/userfiles/files/42225441397.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16144366e4635a---84065096353.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=forensic+document+analysis
    • 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_off0000ae11.bin
a28d13f38e3fd2341aaa7e604fbc841855ae179cf429c18189869cc91a030dda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE11 10720 bytes
font_01_sfnt_off0000c6b1.bin
5216f66bd87c518bb17f2ea01b1212a97e5509fd462095b473dbcf9803703fae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B1 15540 bytes
font_02_sfnt_off0000ee2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 16792 bytes

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