Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b66e3011cae8d8e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 12:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9065d953c261dd54f5ea06c3478918aa SHA-1: 93909144fdc9caae09bba86c7f2ada02c17a7995 SHA-256: 9b66e3011cae8d8ed98d6ed8f1b349712041c3964b4ceafedd0d888ab834a560
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that redirect to other PDF files, characteristic of a link farm designed to obscure the ultimate destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern as a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://psycare-spb.com/userfiles/file/35348957869.pdf
    • https://dermatologie-chamonix.com/userfiles/file/69819902378.pdf
    • https://shunnasato.com/65993305922.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/71182932593.pdf
    • http://scea.edu.mn/ckfinder/userfiles/files/pirov.pdf
    • http://fanghsin.com/uploads/files/202109080907002992.pdf
    • https://ripedzn.com/app/webroot/files/fckeditor/file/95977210857.pdf
    • http://lycee-elm.org/userfiles/file/dagofakukikeledif.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/17lqm50tdruj07uli6rgiqfp4r/64013713605.pdf
    • http://studiocastigli.eu/userfiles/files/dovetixomijomuzafalu.pdf
    • http://eraldocomo.it/userfiles/files/6076589613.pdf
    • http://hoteldanang.com/uploads/images/files/19123168252.pdf
    • http://sgpeo.pl/users/file/nonadegokukidopusojubabu.pdf
    • http://strahovka66.ru/userfiles/file/gokukim.pdf
    • http://newbusan.net/FileData/ckfinder/files/20210915_59D4456090A3B899.pdf
    • https://podgoricki-klub.me/userfiles/file/84067779922.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16143d44ef0ddd---liremesofumegajadovumo.pdf
    • http://hkbroadwin.com/userfiles/diwifodusux.pdf
    • https://sunarchegypt.com/userfiles/file/kudez.pdf
    • http://penetrat.ru/files/files/votag.pdf
    • https://semsaesp.com/ckfinder/userfiles/files/winon.pdf
    • http://soundspace.eu/Upload/file/20917294824.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=app+to+share+data+between+iphone+and+android
    • 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_off0000def2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 16792 bytes
font_01_sfnt_off0000f709.bin
9c341072d8586f490cff79d1e15a6724c46b42511984faceb3873347c98f00bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 10652 bytes
font_02_sfnt_off00010f3f.bin
f7be8f440e699ef238bbcef9cc327183f44e513b7e156b7bd6dc869f1159c65f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3F 18164 bytes

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