Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed64ab90e45bd643…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 03:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6795cd086ae080a5d8c1ba753652b5bf SHA-1: 943d56df31a5dd14fd1b8706c05cf742b787ab37 SHA-256: ed64ab90e45bd643c8df02e01738d0ff03ed091b887370ac9a5b450482f565b0
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, characteristic of phishing or malware distribution campaigns. No scripts were extracted, but the overall structure and heuristics point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://huaku3c.tw/uploads/files/202109091946464554.pdf In PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc9ea2242---2597909064.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/43361245506.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/73148384220.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dhvn5bsm7nj8dc8csve4ca5tn5/65633857032.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/82326014537.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/genum.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/zojuruvevonomibisopitur.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/folepiderenod.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/37876721072.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/xezebategonosuferideva.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/47214238506.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/33954797705.pdfIn PDF document text
    • http://zzquansu.cn/d/files/logelivunomuluxawewom.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/validumamopononim.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109100733171182.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/98507826905.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/nukazomaxapedetas.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/34018133939.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/xijexaxexeve.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/nilebovodo.pdfIn PDF document text
    • http://centromp.it/userfiles/files/wokufiwaxegodivanadosuru.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/lurubupeta.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/26514942761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+best+app+to+recover+deleted+videosPDF 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_off0000d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 16700 bytes
SHA-256: c36f62383b2838bcc93768ee90ca5324db1d528062e1b348f1fed2aa11efe526
font_02_sfnt_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 10676 bytes
SHA-256: e9c154afabccf7bd9015e5f45c3bb94c4950198dc46293e1bc4f9e597895ea1e