Malicious PDF — malware analysis report

Static analysis result for SHA-256 93863e54cd84374c…

MALICIOUS

PDF

71.3 KB Created: 2021-09-26 01:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cb80dba24fc0e0d6007bf24d934c29b SHA-1: bbf888e6336d85d1791ae2fbe399e7366454e875 SHA-256: 93863e54cd84374c0a22977ed438059989c6ae4add65c394dc08600a9064578b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further payloads. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest a spearphishing attachment (T1566.001) designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://gdlejia.com/uploadfile/files/20210924_025253.pdf In PDF document text
    • http://bobmeetin.com/media/galleries/files/73732732514.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/rubegoxusozo.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/47126025168.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/98257186356.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/vulafodadupu.pdfIn PDF document text
    • http://adm.stikom-db.ac.id/js/uploads/files/lezewevevidon.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/tidutidiwofitupup.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb462d1eda---67569228209.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ea38c74c9de886f3e4e239ba0a93f555/93974598945.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/2261406757.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/36983787498.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/55035612390.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/lajefizezujonakob.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/balit.pdfIn PDF document text
    • https://www.poole.ed.jp/system/ckfinder/userfiles/files/jiwezomuxexuda.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/miburugojefirad.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109232047157380.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/xerevaxeged.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/26011905863.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/95237223382.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/guworetiviwuzaxaw.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/pidilivuvuxusojibo.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/pabifokar.pdfIn PDF document text
    • https://netpage.info/userfiles/file/pexalilud.pdfIn PDF document text
    • https://estoniapools.com/contents/files/65422097790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=they+both+die+at+the+end+pdf+free+downloadPDF 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_off0000b2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB06 10732 bytes
SHA-256: e30eaf84a4ced3df3770189cc8650e9c2d8217c72ab8ad856cb2ca34b6971316
font_02_sfnt_off0000e36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36D 17028 bytes
SHA-256: d91c25458b71b7d7729c3f238bc25e4ddccc2297429463e52ed8ba9d3f37460a