Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4aa85dba24634ea…

MALICIOUS

PDF

86.1 KB Created: 2021-03-03 04:58:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2c4331aaa1f270bf1b2b89d8e7c31db4 SHA-1: 8a86654c36b788bf1ba8259ed7bf13536c139a04 SHA-256: c4aa85dba24634ea580bf0f773f32a666b6a399fa5d758054ca92c308516bd49
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9995

Heuristics 4

  • 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=where%2527s+waldo+dirty+pictures PDF link annotation
    • http://waranijovuv.sportsontheweb.net/apollo_twin_driver_catalina.pdfIn PDF document text
    • https://cdn.sqhk.co/wibafozadil/gg1Q1jd/ninobevuvazoxuke.pdfIn PDF document text
    • http://lexamopelezun.mywebcommunity.org/xuletej.pdfIn PDF document text
    • https://cdn.sqhk.co/pavupaken/V5sifA2/cobone_deals_special_offers_jostens.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_603c0cfc6c3fa.pdfIn PDF document text
    • https://cdn.sqhk.co/lexikegije/iimjbv5/mavoruwuzi.pdfIn PDF document text
    • https://cdn.sqhk.co/lomekojop/9gcgieV/skyturns_platformer_arcade_platform_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379969/normal_5fd9b715ea6ad.pdfIn PDF document text
    • http://tarusexozof.iblogger.org/feburisumofakotajediwilu.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/Whjiczr/nobojumiregaloginavag.pdfIn PDF document text
    • https://cdn.sqhk.co/bafiweba/hKshjgx/the_farmer_s_dog_cost.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476767/normal_5ffe4b6f8c819.pdfIn PDF document text
    • https://cdn.sqhk.co/lexuxeza/bhjicVJ/huey_freeman_boondocks_voice_actor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pakekaririwofas.rf.gd/browser_ling_whatsapp_jio_phone0.pdfIn PDF document text
    • http://newurefaz.epizy.com/formations_avocats_sans_frontires_france.pdfIn PDF document text
    • http://ruzoguniwu.epizy.com/89336573543.pdfIn PDF document text
    • http://logupenevetisi.epizy.com/sony_str_dn1030_remote_control.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 5400 bytes
SHA-256: 9b3814cf98664e3e07ca1b0824743302f798a57384062e2afa26bd9e2bacbeda
font_01_sfnt_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 3780 bytes
SHA-256: 172e13e9a3e26b6bb77d12dd9ec83e666a308e0ce8dcab3e5a8f329e4c8d0e3f
font_02_sfnt_off0000f930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF930 11316 bytes
SHA-256: 4809c4655ead77b15f2e669f5688ab8a29f914ea74573b29ca993416b1cfcf56
font_03_sfnt_off00011f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F68 18304 bytes
SHA-256: 04889cec7059d7a7ad8a6690d35843c09aafb066f78053cad5b6db8b43e41a3f
font_04_sfnt_off00013ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE8 6140 bytes
SHA-256: 301cd440ae6bacb9ef10388cc42f65c92dddde1616fdad947326b38cfb696e57

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