Malicious PDF — malware analysis report

Static analysis result for SHA-256 321e24f3fe3f4c5b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 14:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a82346281caa3c592ca8c069e8ff3e65 SHA-1: 0816ad463418e5129bde988170212d119d1e7484 SHA-256: 321e24f3fe3f4c5bf0db2d8e5f26e19223562003af1614554392e27328e851aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains a large number of embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's purpose is to host numerous links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 5

  • 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.
  • 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://matras-matrasych96.ru/admin/ckfinder/userfiles/files/redavamasatafizupuladina.pdf In PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/tavugunajeriwigawo.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210902122643.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/5549542075.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/61005884439.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/26595110329.pdfIn PDF document text
    • http://fertilizerproductionprocess.com/d/files/lolibiperawanig.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/kizodepupisugelaweg.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/ponulamerej.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/58394614649.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/17138750853.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/taniwulema.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///pabusagugawoto.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/likesapimetivisasomoxum.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/75405321322.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/nivizusadofapazojuki.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/dixodoviwoxebedeled.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/23556dae7f6b808158222bc260908b60/26416254499.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/6197426250.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/bikopinejixomutikupemon.pdfIn PDF document text
    • http://ipceurope.be/assets/file/46121169289.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/sinejedebopotim.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3f87997d---43867706665.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/sopeveguzufamiluwufaga.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/meruzemasanax.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/dirixususekibewojudolex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=2012+dodge+charger+service+manual+pdfPDF 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_off0000deff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 17256 bytes
SHA-256: f122fa2b23f7d020a391b4998ad2311ea9400fbf781fcf6b5a71048682bcb22e
font_02_sfnt_off00012426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12426 11332 bytes
SHA-256: 5b33cf2695ceca197c0aaffbcd7dfea9e0fbf10ce699976bd6452a15724dc6c2