Malicious PDF — malware analysis report

Static analysis result for SHA-256 d542260d976a5947…

MALICIOUS

PDF

77.0 KB Created: 2021-09-13 07:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba392bebdec99c259c50a094a40ee18c SHA-1: 509981bc418a33a3ef115e4bbe87d9409d03488d SHA-256: d542260d976a5947279fb57fafb3e4106b98c5010f4b6310dba247483ecd30a6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to one of the numerous external URLs found in the sample, which are often used for phishing or to download further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed127c087---89750701674.pdf In PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///nogamaviwenefe.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/fakepuxoru.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/354639a2a25196012824bfc3fff3af22/pamexufuzezeriniki.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/nimododupapavojapel.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/81254555775.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/72375414419.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/14636517121.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/27189657649.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/61584640265.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/dawotijifig.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/vobibotute.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/37275870913.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/pebululomo.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/zupiwidigirimegu.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/42070055877.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/56123730418.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/fenagizogonop.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/kikajirakatafumobaxi.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/fikenuva.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/jeketemabu.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/xepukupusufedakizoze.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/23980825588.pdfIn PDF document text
    • http://wirheiraten.de/images/file/vazufaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=harry+potter+part+1+full+movie+in+english+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_off0000c812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 17080 bytes
SHA-256: ace7edbcb4c299a5d4914d157f1bf2fe64c6af4c1e459d98c88d52435b08b148
font_02_sfnt_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 11352 bytes
SHA-256: cd713a1f845298fcd58b55824659cb2d613248e01f89d78b25a1252d92a94f97