Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5023e966126cdfc…

MALICIOUS

PDF

84.7 KB Created: 2021-09-11 17:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e54f3ea1687cf062c06ebb72f531e9d4 SHA-1: 7ceba9f4218e73fbabbf79a26144f3fb222d5202 SHA-256: d5023e966126cdfc66731986f8b30cd061424fab69130c0b7b94a74b177bd3f2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://k-barrierfree.com/FileData/ckfinder/files/20210906_8281E0023BA392C4.pdf In PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/bozagojalezejizoto.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/vovalameg.pdfIn PDF document text
    • http://szcftz.com/upload/xavufimesenolabutubebubu.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/9cv0ga6bueqc95kuvgufpug212/zapusokosetikoragametoso.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/96932664174.pdfIn PDF document text
    • http://boldogelet.hu/media/31252612549.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161342169adcb9---vizunatabinuvuji.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109110043515304.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/99113347824.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/33026070665.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/92104232497.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/94719078412.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/xabiboberawadewofat.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/pesinamezem.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/85269990615.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/45998053174.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/55727504750.pdfIn PDF document text
    • http://btfa.tw/upload/files/soxolugerozaxepe.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/sapaxamamavode.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210911105129.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/72931431588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=offline+topo+maps+androidPDF 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_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 18276 bytes
SHA-256: db67795e013ffb13939b7fe9cc866247c63a6addd9da99cbfabe106e999b1193
font_01_sfnt_off000114a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A7 10684 bytes
SHA-256: acea6922c6cabb66310ec21344263883b7dc8ed5c8ffd8fc6a99f074e48f16e2
font_02_sfnt_off00012d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1