Malicious PDF — malware analysis report

Static analysis result for SHA-256 c466d4a44e846170…

MALICIOUS

PDF

68.5 KB Created: 2021-09-28 04:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0f0819bb87a7441f778f0e30619b9452 SHA-1: bfdcd33bbb22d3535324dfab70464e66cbcea5ac SHA-256: c466d4a44e8461701cebac73019f9a9c1930c9844fc590159b9fcc95d82d5728
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosts, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to obscure the true destination or distribute malicious content through a large number of unique, low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cmi.nfe.go.th/ckfinder/userfiles/files/wexobiwumexiximul.pdf In PDF document text
    • http://kinel-hunter.ru/upfiles/file/baluzapaxijikemojamomovaw.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/66288160977.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/16310066105.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/xijitepifotusobukabewu.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109120951148518.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/49529506831.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/pubesom.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/talad.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd097201eac8177d4f17a8152fed9d1f/wusuru.pdfIn PDF document text
    • https://atrax.hr/files/66247410504.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/19590940786.pdfIn PDF document text
    • http://espace.peinard.fr/include/images/files/9981562779.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/88336347508.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/nupitagiwalerilogoninad.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/28676051241.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/40476376723.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/67684155992.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/33856949239.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/30710322949.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/77699507902.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/pubijelenin.pdfIn PDF document text
    • http://chinalabware.es/d/files/14589877592.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc02c23ac---ninenetedojabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+mega+emerald+x+and+y+edition+rom+downloadPDF 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_off0000ae44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC656 14860 bytes
SHA-256: 9c7545db4d4f1688bfeb4eec0cfa42820850a8ac403c0909514f88bc1a8a8bc0
font_02_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 10820 bytes
SHA-256: bc593749b4d22926c870cfe1ac87eb7cc2b3e3ec125fab67beeffdf4fbdff559

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