Malicious PDF — malware analysis report

Static analysis result for SHA-256 de58291a2b2dd253…

MALICIOUS

PDF

87.0 KB Created: 2021-09-12 23:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 611f3cc38b580d393bbab9c2daa43a5d SHA-1: 2364492b7b60f056e1fa901749639b5fdc549d6a SHA-256: de58291a2b2dd253add5eb049b9b0d97625215ae82c0887c50a8fdcc934575f1
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JS points to T1059.007, and the overall nature of the file suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=pixel+gun+3d+mod+apk+2019 PDF link annotation
    • http://kadh.kr/bobod/upload/file/pabagolugukulijefexemuxa.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fixamigaxupob.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/22222035973.pdfIn PDF document text
    • http://kdekdyjak.cz/data/vosad.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/91082175407.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/fumotabusabidi.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/vikazu.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/77547544858.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/rokuwakunuzoginevor.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/88602114972.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/17421796864.pdfIn PDF document text
    • http://holzbau-napetschnig.at/3810575550.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/29081441925.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-11/20210911150215237408.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/wawilewefitit.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/53781741493.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/sugex.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/59042235157.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/73807510748.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/26287876662.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/57459237132.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb7d426fe---54116523153.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/tinukupovu.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/fogonogodukabezebakojoso.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613e025d0caa2---99537580513.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/80392180653.pdfIn PDF document text
    • 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_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 17088 bytes
SHA-256: 09a8554bd2f4b676bcda18e0c13dde438460fd1fc256625906872bc89b6397f3
font_01_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 11296 bytes
SHA-256: a5176a468cf59ff1d931c4fd3c041a51fe86a1fbdd21b40ccf2d5df3703ee369
font_02_sfnt_off0001361d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1