Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f224e49cfb8637…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 04:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 31c74ab3c78b57ceeaaa2e6eae506e49 SHA-1: 35bd6bfd0f540379bcb6629995bfb3de99e369ee SHA-256: f8f224e49cfb86372878c13e5aef9f5d5922bf86c0421c6f9abe7d5734040135
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URLs, many with 'utm_term' parameters, suggests a phishing or link-farming attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL distribution point to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=best+paid+multiplayer+games+for+android PDF link annotation
    • https://ildiko-szepsegszalon.hu/userfiles/file/70041919549.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/mowupuxematu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4005804a---xexin.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/34300593059.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/37979850106.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/rogoketetam.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/govanaze.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/fegijigebitetagoze.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/lofitabunonijubu.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/80861514892.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/fezuximizigenesasuwawejo.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/vudum.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/memamoxawoxukivepad.pdfIn PDF document text
    • http://immopolignano.lu/images/fipinufopeta.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9a809bca88d3291a81a46eb248991030/gitunipebagud.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/tirikatifuzovev.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/7430500379.pdfIn PDF document text
    • http://araratmebel.ru/img/file/bazuziwatobikumidow.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/salodebafarig.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/37493268960.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/botofolijudexugobez.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/lemutatuxipu.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/14722513513.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_off0000afd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E8 11108 bytes
SHA-256: 23f7106b7bd6eb9ddaf84c1b6e14467fd597fc60e6a21225e46bb5ad012fc4bf
font_02_sfnt_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 16952 bytes
SHA-256: 96ed2f5dab6d32a6edb7958cefb853555316dbb7961f594e0e8854c43540202e

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