Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbee6e80ebe5487…

MALICIOUS

PDF

79.2 KB Created: 2021-09-11 03:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 90c6a2646289a503eb472250015b2de5 SHA-1: 28aee4688451000ad06793ce8e3a41a269d19124 SHA-256: bfbee6e80ebe548700932d685c798d1045df48cf40efd72f1766b7452f0cf6a2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://www.findvoters.com/userfiles/file/jumudenumaze.pdf In PDF document text
    • http://groupkaishan.com/d/files/xenuruzisarawus.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/7779548676.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///busiv.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/66081272660.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/letuzunojomafixekotu.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/godirepokezarupelamowe.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/vunegawibitis.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/78264412209.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/5706242844.pdfIn PDF document text
    • http://drironcat.com/images/file/757193677.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/98753399150.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/72202676296.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/47397303574.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/pakefakosumusenu.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/segirufulitaxizudotun.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/7927861094.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca80ec454---93390169925.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/3337711076.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/72055325729.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/mazefiwipokanijolitig.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210908202335.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/90572269404.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/77002973598.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/57811213045.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/14251012726.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631109343NK5D.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=genshin+redeem+codes+may+2021PDF 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_off0000cf88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF88 17288 bytes
SHA-256: 3e8426b8e69f348a872450693bdffe351b68135d922718da65a8ab103f374421
font_01_sfnt_off0000fc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001143b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143B 10940 bytes
SHA-256: 65e6fe825f4acfcf8e6c946d456a4865fa77bdf4b60d109c0e7b440e745cbd63