Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd66476914af7fdf…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 23:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 003b36781fa6183f5df32a615338044f SHA-1: 70944a1de2868c5adb553ed99cf08411aa7f17c6 SHA-256: bd66476914af7fdf97e911ded0e23cbac7b97255540a3ffc2b529766e09b9832
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a phishing or malicious redirection scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The ML classifier also flagged it with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2154b0edecfbfaea229d1b701f2fc540/wulidejomisaro.pdf In PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/8819712712.pdfIn PDF document text
    • http://elma1.ru/!upload/files/kasemijikoxan.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/22427966319.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/lixuleturina.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/50548453997.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/39249901026.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/61431395986.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/73542889512.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/28064030746.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/tujivumejopejovam.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/62522710831.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/jejuraxaluziku.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210910102152.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/90988972987.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/kaburubaxokutola.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/luradepuj.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/59427393831.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161451f4be61ff---nodixipikinepodidurizurir.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/towurinaworokomimebu.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/xagalimuzawifubugobeti.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/lunudemabibawujudelepa.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/59040291031.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/rovubigekemipodesosifefip.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/rorodanazobazimepepige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+connect+wifi+network+in+android+phonePDF 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_off0000cf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 17120 bytes
SHA-256: 8ea8d0bfbbd6d938a72b7feb3c33164fc7a8375188cef84121a798bed4973fa7
font_01_sfnt_off0000fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 10672 bytes
SHA-256: 91a382de67e1e1462edcc5fed8c16f9a9fa28ab185a93ac6db1e17223fdd2470
font_02_sfnt_off0001146a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1