Malicious PDF — malware analysis report

Static analysis result for SHA-256 f461d997655317c6…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 06:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a1efcbb6886195833bab93fac6f22f4 SHA-1: fe4051c4fcfc23a83cbeea93c6cfba7612ca2764 SHA-256: f461d997655317c68e90e03fdbf455473e6f700b0e2073cd9152e6dd7be50941
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.ebenisterie-burette.com/ckfinder/userfiles/files/jojelafamo.pdf In PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021942242578102.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/vezazutanijuzi.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/79857007460.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/49927527283.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161427ebeea6df---10416812149.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/xijepevadixatusek.pdfIn PDF document text
    • http://standdominica.org/files/files/99192434810.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/mufawapesovekunozalure.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/jijarijefatenexevinavuzo.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/11606052981.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/buwaxi.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210909033436.pdfIn PDF document text
    • http://12shio4.com/contents/files/kifar.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d43ceec888---xikitebepi.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/jirupidosi.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/55814387337.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/movovozijapere.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/vigeguvifigamaberadetebu.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/relozagivibeve.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/79277323042.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/98151610056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+6+dbzPDF 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_off0000d24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 9984 bytes
SHA-256: e67f91ecc0525fb8057f210394bfe3b17b13c65d23ce213dfc42366adb2d1ab9
font_01_sfnt_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 18244 bytes
SHA-256: a1df54e4d8fb57c689e8b54671ef198c2a5c0c456e29c8d66b3a6789b613c197
font_02_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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