Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca88a418af6cfcd…

MALICIOUS

PDF

89.9 KB Created: 2021-02-27 23:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d4f8065f086fad2c57916734fe012277 SHA-1: 7bee1cfb76c032b776157f1366416d105bbb6623 SHA-256: 4ca88a418af6cfcd90781e70fac56dfafba38931141e64eee5a6cb0b1d957611
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a strong intent to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links on low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/123?utm_term=gregor+the+overlander+underland+chronicles+book+1 PDF link annotation
    • http://xumupizaxuto.scienceontheweb.net/jefipek.pdfIn PDF document text
    • https://simokenuma.weebly.com/uploads/1/3/5/3/135311421/rozuzuledo.pdfIn PDF document text
    • http://megantv.site/zavefewudaxuvaba2am0p.pdfIn PDF document text
    • https://gitakitopawal.weebly.com/uploads/1/3/5/3/135325500/8472ab173944.pdfIn PDF document text
    • https://gesuveta.weebly.com/uploads/1/3/2/6/132680901/ratuz.pdfIn PDF document text
    • https://xevefozivoro.weebly.com/uploads/1/3/5/3/135339272/1defca4b1ae.pdfIn PDF document text
    • http://pibarulajido.getenjoyment.net/86505939379.pdfIn PDF document text
    • http://gafavow.22web.org/71708725374.pdfIn PDF document text
    • http://maska-respirator.shop/what_size_chain_is_on_a_stihl_ms1801skn1.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/mhgqa6m/mololulagogopubu.pdfIn PDF document text
    • https://cdn.sqhk.co/dafiwexoki/bjirVmG/wajoketizetekeso.pdfIn PDF document text
    • http://allostar.buzz/lilalaninitufakimilaridir6fis5.pdfIn PDF document text
    • http://swast-group.website/game_pirate_king_facebook2kpzj.pdfIn PDF document text
    • https://dosisusibifoba.weebly.com/uploads/1/3/4/2/134236234/tajiv-kotenenetoretit-boviwiwovi.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/ruxixigukuviru.pdfIn PDF document text
    • http://megalit-korolev.ru/welcome_to_bloxburg_freemleb3.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
    • http://dodarululi.epizy.com/xumajogaradiw.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/soxoxuvugetafodimewirer.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/88694686242.pdfIn PDF document text
    • http://jeparilusukopof.epizy.com/52805256365.pdfIn PDF document text
    • http://poweradufuxi.epizy.com/eset_mobile_security_premium_apk_2018.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_off00011549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11549 5428 bytes
SHA-256: c7841e5350e43ee8a146dd7d63250ae65a4a88d0870737fd669c79f6f8f97c01
font_01_sfnt_off000127c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C2 10496 bytes
SHA-256: 9caa558f335195632bf96e2decbff280816313686d1dd0e12b5d685f7efc65e2
font_02_sfnt_off00014b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B52 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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