Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c571780f5ad47d…

MALICIOUS

PDF

68.3 KB Created: 2021-09-27 06:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6d9f61321c6f49888bb0f705de2dc95 SHA-1: c312bc307c2d07a9122fd7b2eda7df4ad4ce3613 SHA-256: 43c571780f5ad47d06eba176f21364dc0f043ea68210b93aa9411daf010ae79e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. The 'PDF_IMAGE_LURE' heuristic indicates it's likely an image-based phishing lure with a clickable action. The numerous external URIs suggest a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://casinodanmarkjackpot.dk/userfiles/file/93293893562.pdf In PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/58947992781.pdfIn PDF document text
    • http://trovas.com/userimages/popixumowovok.pdfIn PDF document text
    • http://ipceurope.com/assets/file/24628541403.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/64553999666.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/nitenupe.pdfIn PDF document text
    • http://halaljones.com/uploads/files/vagovoki.pdfIn PDF document text
    • http://jaqalsports.com/files/file/40641158898.pdfIn PDF document text
    • http://cl-pub.com/files/files/97617936671.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/93743388107.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/nopifetu.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/wixuxibipomikasilukepel.pdfIn PDF document text
    • https://alohasafaris.com/files/xawakemaramuxo.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/h9iaqoa47lcbo7cc4a9f9fk7c9/bidivativaxekuji.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/82308782921.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/jakixexufivejikidi.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/peferufimebemefamad.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/niweditavaroza.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/petorixagim.pdfIn PDF document text
    • https://palet-school.com/files/files/fojegopobivopinokejupo.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/mepunulebufavurov.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b56868e5d40311b2e10bd31595c6e486/zumenum.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/xibatezinitoguneg.pdfIn PDF document text
    • http://dienhoabacninh.vn/webroot/img/files/bawojewixelitovopononipin.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210912055734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mod+v2+top+g+apk+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_off0000b1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E2 10432 bytes
SHA-256: 7b8467c95a9fcbb48fd5c210331e8e495834907a58773fd36daae69ac513fc8e
font_01_sfnt_off0000c994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC994 13740 bytes
SHA-256: 7a071e1a2d9f18c007e54539e3699fb2c38d4a168316d97ca6b28e204d1217fb
font_02_sfnt_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1