Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f74c982b27fc0df…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 07:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 677254d81c219ca665a77adcd3883c0e SHA-1: eda93bbcb15f3074fba04acc99bf36d5e201bd94 SHA-256: 5f74c982b27fc0df6db3b6af4a2c1153c593d8434d640f38d42887ffdf9de0fd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are associated with link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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 http://hermandadperdon.es/userfiles/file/pevivopolobadinason.pdf In PDF document text
    • http://medrea.ru/upload/files/19269464072.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131bc528bccd---kofuzebubaxoboxufe.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///60032543360.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/83695902036.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/79794484392.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/tavudoguvosutowuzijopem.pdfIn PDF document text
    • http://montesantangelo.it/files/files/28407504324.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/15816208807.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/jomor.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/45294897502.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/gofukebixejoxogop.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/purerububanududovomunugam.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/62916899622.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/ludulufixizuraxamaja.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161356b8a8f417---xazisimukatewa.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/joxekipetosozazijera.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/71067005086.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/raxewadegagogofugalaj.pdfIn PDF document text
    • http://viorina-deko.com/images/file/25620393717.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/rukimituvamisuzexiwaluzo.pdfIn PDF document text
    • http://paliukenas.lt/i/File/28836038373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=principal+square+root+definitionPDF 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_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 17232 bytes
SHA-256: 80dc1f47c7d234c666a753c6a3d8a46b57c1ad60b87e7813c972ffa098b99e2b
font_01_sfnt_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BB 10860 bytes
SHA-256: bcc91b3d2c2486795df480bf5c4e8f09c03d2e7cdde0688d4d4d1c33ef568558

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