Malicious PDF — malware analysis report

Static analysis result for SHA-256 3592707137481ec0…

MALICIOUS

PDF

81.3 KB Created: 2021-03-23 22:29:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a3fd827d01c4426aa7f1c099e7d67146 SHA-1: 425987adb8f22ca1c0483eca2b36e3e6d51f622e SHA-256: 3592707137481ec0c64f58b49156ad3f5006c0e48f377c8794599f96d1918e03
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external PDF files, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. 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 embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/wix?keyword=the+heron+and+the+hummingbird+oxford PDF link annotation
    • http://fefikaniki.22web.org/83528151483.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/algorithmic_trading__quantitative_analysis_using_python_udemy.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/add_2nd_edition_dungeon_masters_guide_download.pdfIn PDF document text
    • http://kuziluzesoga.22web.org/darugoguwewewapaxaxu.pdfIn PDF document text
    • http://songkfrk.site/levers_and_pulleys_worksheetkdic9.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/avidemux_tutorial.pdfIn PDF document text
    • http://sidazolomaw.22web.org/24295580871.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/12040756654.pdfIn PDF document text
    • http://idealslimitaly.site/drug_discovery_today_author_guidelinesf4sw3.pdfIn PDF document text
    • http://kimokabif.medianewsonline.com/sibawerilivekivajud.pdfIn PDF document text
    • http://oneplusonemain.xyz/956109802654t4g.pdfIn PDF document text
    • http://womans30planet.com/las_barreras_de_la_comunicacion2sd6i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aa61b45-efa0-4cad-8870-5d53cf8b5863/64532940534.pdfIn PDF document text
    • http://wetowudokik.epizy.com/android_21_good_dokkan.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/bergson_time_and_free_will.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/gasosesuxilati.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/voguna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19ed8135-8b2c-49a5-a94d-c833dd7ee437/what_are_some_examples_of_conflict_resolution.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/fanudepoku.pdfIn PDF document text
    • http://supikovibamukip.epizy.com/10446554363.pdfIn PDF document text
    • http://vovugezufined.epizy.com/junipopabab.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/cms_report_page_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03bb9f9-2ec5-4e01-bda8-1e2be87542b4/dozijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4359fbfd-0cc2-4b20-872d-4ab701e13d2b/xufawetibeboxeduli.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_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 4308 bytes
SHA-256: c781778af5148acd5b158cfb6978aa32c83eb62a7da19be26b920884cc0f3354
font_01_sfnt_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 5268 bytes
SHA-256: ea8bd1d435a3f1d83daa65405b697d3a8d900316ef7f511f33402e9d90f529a9
font_02_sfnt_off000105eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 15228 bytes
SHA-256: 63a639d1204de650c598c0f8a8fc3e2c22b238cdd1f982384ef9e5d65ac56813