Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28f742797c09cde…

MALICIOUS

PDF

78.8 KB Created: 2021-09-23 12:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0260d85206e53586a8c46bb009bcd47d SHA-1: a1d3b068e73839fd229c0929376b73d99f924ffe SHA-256: c28f742797c09cdee388e4a5067f581cd433fe418b90fe1858fb93750626fb83
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 a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and the nature of the heuristics indicate a likely attempt to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://greenbins.ca/ckfinder/userfiles/files/fadoburamategiwexamos.pdf In PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210911_F25D4F69BCC7CA1E.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/fabonija.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420090620cb---94323958359.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/33698146889.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/37936609988.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/47198963010.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/zugelosiromoliroguzoj.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/gasitotopawubafuvapon.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15265261552.pdfIn PDF document text
    • http://lgassociates.in/uploads/dezirimozarasoniba.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/zabomukiwafotuxix.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/75777206133.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/79748586404.pdfIn PDF document text
    • http://skene.es/userfiles/file/6656247600.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/51195480534.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/67778809678.pdfIn PDF document text
    • http://ilovestory.com/upload/file/37809452065.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/59324780324.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/noline.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/nuriruzeton.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/1689770489.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68ca18e55---jawul.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/42029967154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=carp+fishing+simulator+apk+modPDF 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_off0000ccd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD3 17948 bytes
SHA-256: 02db505a7fe870f258f1a5561414409327c2961df7e78c01036e45848d647d4f
font_01_sfnt_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 11036 bytes
SHA-256: c83b47d801a8ef0a1109f99e259eb6d8b434853a83e4853115352fee152602b3
font_02_sfnt_off00011557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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