Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d56dd5d333f010f…

MALICIOUS

PDF

71.5 KB Created: 2021-09-29 03:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9ce031f8c5abfe5c231e4965af6b3f7 SHA-1: 2f621f5ee88811250f0f2af4ac6ae4bf48694bda SHA-256: 5d56dd5d333f010f1f87eb6f2006141aa83d7e6d812cb7b3fc743f3a0d23001b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URLs, many of which appear to be part of a link farm designed to redirect users. The presence of JavaScript indicates an attempt to execute code, likely to facilitate further malicious activity such as downloading additional payloads or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=how+to+install+kodi+on+an+android+box
    • http://german-ex.com/images/blog/file/mivoxijumetipuw.pdf
    • https://www.leasing.net.in/ckfinder/userfiles/files/tomojugizumireniwupejun.pdf
    • https://mokhalasati.com/userfiles/files/nusazokiwevaw.pdf
    • http://pwmtqatar.net/userfiles/file/tukomifasefiwodi.pdf
    • http://nriloan.jctoursandtravels.in/files/71636284413.pdf
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/86062049854.pdf
    • https://nucamsa.es/userfiles/files/50797554256.pdf
    • http://schodylux.pl/userfiles/file/46884441002.pdf
    • http://konferencii.org/js/ckfinder/userfiles/files/kixogulizefe.pdf
    • http://khamtribacninh.com/images/files/84671277194.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614314b5282f2---xujibesafujanekole.pdf
    • https://www.mds-horizons.com/upload/files/jowisoneruporufol.pdf
    • http://kitpaisal.com/mypicture/file/jajaxajazo.pdf
    • http://radiosalsa.fr/php/rs/filesupload/file/6211326337.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/82696700896.pdf
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/92356234732.pdf
    • http://rm-centr.ru/uploads/file/90206527262.pdf
    • https://louvre.lv/res/wysiwyg/file/befejo.pdf
    • http://ssatripoli.org/userfiles/file/vurugazejalukawipezuwasav.pdf
    • https://rippa.pt/files/file/xolidosutanovanurugofem.pdf
    • http://wcsps.com.tw/ckfinder/userfiles/files/kutunemesivo.pdf
    • http://ilksolar.com/Images/Media/files/vajajumudo.pdf
    • https://smartech.lv/sites/smartech/uploads/documents/files/gamazalisolokuja.pdf
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/temadumariwijol.pdf
    • 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_off0000b2f3.bin
3607ea6726bdd8b58d75f2bc68af506d92dff19bb11bb1835d33ee6c3b32ccea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F3 17764 bytes
font_01_sfnt_off0000e066.bin
9e8546533a360af38f5494dcfc13d9eeb7c1e810da04123a23d4b5d18b073d28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 10520 bytes
font_02_sfnt_off0000f87a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 16792 bytes

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