Malicious PDF — malware analysis report

Static analysis result for SHA-256 539d5c4fca2ab2e8…

MALICIOUS

PDF

75.6 KB Created: 2021-03-11 08:23:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e448089f2cf137ca2119f39167a0248f SHA-1: ebf49d5a6da5fc45ee3c8a7648bc5fca23c449c9 SHA-256: 539d5c4fca2ab2e841fe7f3c5564dc8f03f670270ff5368878bde653133cab25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=what+is+social+research+and+its+characteristics PDF link annotation
    • http://jomikifu.medianewsonline.com/cadena_de_suministro_lean.pdfIn PDF document text
    • https://jozugirizozixus.weebly.com/uploads/1/3/2/3/132303278/pomaxokesajag.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/L7mgevx/candlestick_chart_trading_tips.pdfIn PDF document text
    • https://kekisadubivef.weebly.com/uploads/1/3/3/9/133986731/pubonukukik-nusulozinu.pdfIn PDF document text
    • https://cdn.sqhk.co/bowawugafux/igKkWwD/skyraider_ultralight_kit.pdfIn PDF document text
    • http://zamowafa.mywebcommunity.org/zevuxalupuvoxi.pdfIn PDF document text
    • https://wujemalevimovud.weebly.com/uploads/1/3/4/4/134470439/toxowebal.pdfIn PDF document text
    • http://mibikazut.mypressonline.com/25903286668.pdfIn PDF document text
    • http://melidagerukebel.sportsontheweb.net/microsoft_excel_flowchart_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/jaH1j01/tisukuwemubaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/69144393230.pdfIn PDF document text
    • http://teropisarazo.myartsonline.com/2016_toyota_corolla_le_eco_for_sale.pdfIn PDF document text
    • http://bolesumedinix.rf.gd/17998611687.pdfIn PDF document text
    • http://majexubul.rf.gd/texas_hunters_ed_final_exam_answers.pdfIn PDF document text
    • http://tefotifomasun.epizy.com/what_is_the_difference_between_bose_acoustimass_10_and_15.pdfIn PDF document text
    • http://temitiz.epizy.com/59075188589.pdfIn PDF document text
    • http://femavumifixomud.rf.gd/vilomozom.pdfIn PDF document text
    • http://ripeterub.epizy.com/cookeville_weather_report.pdfIn PDF document text
    • http://voxinuxo.epizy.com/14868103418.pdfIn PDF document text
    • http://koxosam.rf.gd/51152697148.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6C 5040 bytes
SHA-256: 3c87f843f49bcee6e28299e9624c0d4f462e01cac87e8d1ae1f6cfc3293c1c09
font_01_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 10592 bytes
SHA-256: 0b918ca8f3e7b571669406a3464d84c8a210fb17ea606e8a3c61d09c5622b8eb

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