Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca4f87387921046…

MALICIOUS

PDF

85.7 KB Created: 2021-09-22 23:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebe82b260bd3b5e7d2b0a04061766ec5 SHA-1: 31dc3489dcc19255e00d7f6eaa97520315742e49 SHA-256: 0ca4f8738792104622c2aea1715663bcb0deddf9f14b4fa3d14e2000c9d9116a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating phishing or trojan activity. It contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users. The PDF's structure and the presence of external URIs suggest an attempt to lure users to malicious websites, consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fundacjanadzieja.com/images/wyswig_images/file/nubuzajevo.pdf
    • http://yokosohk.com/files/fckfiles/file/jolosujadupopiziw.pdf
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/82214527873.pdf
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/ponategojogejor.pdf
    • https://yasacompany.com/upload/files/pitudutexomumiwedojotirib.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/42462728331.pdf
    • http://transportdiverse.com/uploads/files/wupenadulonafesamu.pdf
    • https://bilegt.mn/userfiles/files/guvazijifajususonegiba.pdf
    • http://muasamhangmy.com/ckfinder/userfiles/files/dujaxotebotobobupir.pdf
    • http://nuitsdartistes.eu/images/file/bosopepikuvilalurija.pdf
    • https://hagabb.ro/ckfinder/userfiles/files/67020181562.pdf
    • http://cameragiaminh.com/upload/files/24923359124.pdf
    • http://www.dawnrotaryclub.tw/UserFiles/files/kaxorirekerabale.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f92a5a7886---motoruwexi.pdf
    • https://indobaliart.com/sitefiles/file/43405857582.pdf
    • http://haiannweb.com/uploads/files/wixenep.pdf
    • https://stepweystudy.com/ckfinder/userfiles/files/1156260114.pdf
    • http://delfosventures.com/userfiles/files/penovefuranededivepibelu.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/51557e5c8c89377c86fa71bed3653e21/16087199997.pdf
    • https://oxfordjsr.com/userfiles/file/satedewuverasuxaxizewu.pdf
    • http://www.insight-assessment.com/ckfinder/userfiles/files/xikipobuwepekumi.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/kobusosulis.pdf
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rofelenejikurovokure.pdf
    • http://immobilieninvestors.com/userfiles/file/36866198632.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gaming+booster+for+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_off0000ecd6.bin
6bebf70490491cc3f69b796c3813674ebc1aa9959427859ba626fda57e1acc22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 10832 bytes
font_01_sfnt_off0001059f.bin
c1a561f197ac482ffd5f97675d3233e009f03ea2d49761756710853c300276d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 17024 bytes
font_02_sfnt_off0001317a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1317A 16792 bytes

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