Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd45311243798b4c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 01:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b445ef611eeb61bd229294c48744d223 SHA-1: bb44686a4e51ab609163193162f2c578255082f2 SHA-256: dd45311243798b4c2362ef8eddff0666f64b467fbf4df7bb9801ca69f0280407
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or redirection mechanism. Heuristics suggest it's a link farm on disposable hosting, and ML classifiers and ClamAV confirm its malicious nature. The primary attack pattern involves directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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=android+webview+link+open+new+browser PDF link annotation
    • http://goksirkrupskimlyn.pl/img/upload/files/33567220964.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/jinozezutok.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/vutofumufonolip.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/29761735732.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/767652915f59151018fdf4ad0c6be63a/goreradubenijovufotejuga.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/niwapop.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/59392582332.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/64822247984.pdfIn PDF document text
    • http://didopack.com/files/nuvutilib.pdfIn PDF document text
    • http://prosquash.by/data/95946139699.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/88246165000.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/vudafapabudesume.pdfIn PDF document text
    • http://mp-journal.com/media/file/83479395328.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/42411555396.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/48945785119.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/rufebiwapoxunup.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64510081482.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/42232649969.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/eij25nii2aphn30f4he4udkj31/tazaxozoxobuburepamom.pdfIn PDF document text
    • http://profstil.az/userfiles/file/rufipezoxoxogenafeneto.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/kajajorusuv.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/vebosetofaka.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/62040027731.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/78475090121.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/69389580430.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_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 10492 bytes
SHA-256: 86aba7ab52a59834b5fea0c520e4b7e784ce339d31fd5ce7f90d4171cc34f3e9
font_02_sfnt_off000114fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FA 18628 bytes
SHA-256: 9fa23a8b84f6130c8a9089dadcbe751bf9a187e9fd78fb1f4ae8b12d85dbd69a