Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde31fe0457f229d…

MALICIOUS

PDF

94.0 KB Created: 2021-09-21 03:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 513dcbc17a4d76ab705ca9ebce7b5054 SHA-1: ef265fcdca2158e8c80c31c4453c8c42c5fab997 SHA-256: fde31fe0457f229dfbf2d319bc3906eb4c93f08c05af0b4b3e85f36ecad0422b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which point to suspicious domains hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or spam campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f1bb04df6---21834506167.pdf In PDF document text
    • http://nemdanangpho.com/uploads/2021-09-17/images/files/muxegugaw.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/ripuji.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/pigivixitiwosipuja.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/rizodo.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/kelodovoxisezutuzadiwuveg.pdfIn PDF document text
    • http://adice-area.com/pictures/files/88439348841.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7088809296.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/46029215079.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/duwalobumisuti.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109091207324587.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/82097739111.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/pezimafazinoko.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/zivabotevodorupi.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o92va9if97te4o8nre4rm90002/9035401170.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/nelopozilezu.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/figarekikobaxowukijoja.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/zaxuzogevuvinaweka.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1631837267.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/bovekisikekepumed.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/15814550743.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/ginejapatunumozibuw.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/xidewov.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/79434680544.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/38975208811.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/75281342773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+is+bloatware+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_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 20016 bytes
SHA-256: 34d2867975528f6ae998761c7c2c7560127aa892d970c25531af89334c155676
font_01_sfnt_off00013a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3F 10564 bytes
SHA-256: 5b3556f6e0c57c4ce3b78bd77d6f2a9fc91d7c7adc384e78e0a1480bb7410fa6
font_02_sfnt_off0001525a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1