Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae663b1bef79e9c5…

MALICIOUS

PDF

80.7 KB Created: 2021-04-24 09:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d2b2cc5ef5c43bb756401ce84c98aa75 SHA-1: 2fd614b5d909632742caae9413cf81fd67360ffb SHA-256: ae663b1bef79e9c5b902622ea833ee405d6230d06ddd8b491d762792f780d401
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to distribute traffic to various malicious or phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=fender+mustang+iii+100w PDF link annotation
    • https://cdn.sqhk.co/zitedefew/cJTT7hQ/ragodokupizosoxado.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/cLMpBhb/best_ringtone_download_mp3_2019_pagalworld._com.pdfIn PDF document text
    • http://olymptrade.buzz/muwaruwav3vid.pdfIn PDF document text
    • http://usesucre.pro/195082170954r5z3.pdfIn PDF document text
    • http://hhizmet.com/lexus_gx_460_lease_paymentltow1.pdfIn PDF document text
    • http://pihodze.com/739206240984gued.pdfIn PDF document text
    • https://cdn.sqhk.co/vetesomiw/KihiEgf/segen_solar_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_5df74bdc3f8f4ee5992cdc74a52289a0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/dolugimurogowekot.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/zemujeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d4ec09-8476-4f15-b8c0-0bd5a9441b6d/ms_project_alternative_mac_freeware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7380f5-3a8d-46c9-b409-200c8df12047/87354692451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e63975d2-5392-42ad-b2a6-a5611606dcd2/formulario_geometria_analitica_matematika.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/national_geographic_world_english_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2c5466a-ea27-4ca5-aa91-d0a181152ab3/20987667968.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_2ed9ef8d1fb540869db533193c546163.pdf?index=trueIn PDF document text
    • https://ea0a6730-5b47-42bc-899c-5b27b21b32ea.filesusr.com/ugd/184298_cee1cae0fac049839047b829183cb273.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/timeziso/lotesaxilatixutiganogid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f3be76-ff45-4c13-a2cd-e4b8bf1bc24d/37284864665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22ecb5ae-ea6f-4906-b9e1-bd07eebe9795/dont_be_the_smartest_guy_in_the_room.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 5124 bytes
SHA-256: 6e9c7d3f05b2603c5c0d6518740c84b9915d4842b3d8e70e219bbb5b9eca418b
font_01_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 12352 bytes
SHA-256: 824ba803c1c2c5d2e041d2aea8104f4ebae40c771c9d3ad94b73aa0dce8b5f6c
font_02_sfnt_off000125e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E3 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230