Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca7b5e16430cef2…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 11:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ff28a789fd2212d2093447bf8e142e57 SHA-1: 2d0643822bf13b6d404ad319bff92822033c4580 SHA-256: 1ca7b5e16430cef200f9f1989a36f7baf77997c0d12c6ec36fa47790e9c009c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The PDF contains numerous external URIs, with 21 distinct hosts, suggesting it functions as a link farm. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a strong likelihood of phishing or malware distribution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nomylo.ru/uplcv?utm_term=god+of+war+2+iso PDF link annotation
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c3a1e1c1c960b7be5f7e950e692e19d/waragev.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/68404613015.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/94852286093.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/bedelenixagiwarigex.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/fugata.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a38ce2c1dc905c69bf7cf3f6721aeddf/18005986997.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-27/20210927135909707353.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/73527794037.pdfIn PDF document text
    • https://lapakunited.com/contents/files/lojabajirekox.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/wovozu.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/18548413286.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/32051392435.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/54376925523.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/tajawofirunox.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/95879615101.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/wodutepatag.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/luwukum.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/60752201275.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/nuzimuwotefogirapizab.pdfIn PDF document text
    • http://keacg.com/upload/files/mitudiboludal.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/duxezamogixonuda.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_off0000afdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDD 10212 bytes
SHA-256: c2074d9ab6353ef4ec4a01ac0482ec474beb7a432094ade10f0c0b4ccc365869
font_01_sfnt_off0000c705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 15116 bytes
SHA-256: 52e81171ac15938bb2b9b0fddf7a749b2a2eceadf4372b1073fa594f48d18524

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