Malicious PDF — malware analysis report

Static analysis result for SHA-256 72de33e10135d130…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 20:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d22ebdbe336915a16c6fd2d2c1974a4 SHA-1: da069044f1066b93f62a85416b259f681e048454 SHA-256: 72de33e10135d130b7997ac179ac50d0ef0f939d24bb212e1d4a8c6e8226de2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The primary purpose appears to be directing users to a collection of other PDF files hosted across various domains, likely as a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/19109249525.pdf In PDF document text
    • http://techscreening.com/userfiles/files/panomadejesipoforegut.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/18578978392.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///44231460977.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/92828428215.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/51078865132.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/zejozefitowororo.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/10038066718.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/40672645020.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/vufosesed.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/reriboserufojuvokedebab.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/rebusitufisexubuwavumi.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/timupug.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/detazekejuvokote.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/dijaxi.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/33034561650.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/39068764298.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/pisofelurujuzotow.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/zagupigaj.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/dimuxomibomikezulep.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137e23e58cc0---94216629936.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109012141452181.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/wusipox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=architectural+acoustics+m+david+egan+pdfPDF 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_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 11212 bytes
SHA-256: 3cb83c2cb05213bdce8d02ca42b5180310c5a2614296de2baefbe98f7e024045
font_02_sfnt_off00010b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 17688 bytes
SHA-256: e24753aa3d6b27fc2a85e3524d7e862673a2d270d8d545a6a48a4a394c6b9c3d

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