Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c706b828b642a54…

MALICIOUS

PDF

76.5 KB Created: 2021-03-28 15:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c9a342e4a945f992e0b12126192fea7a SHA-1: 77b96f18103ad5e8bb2f104e86d451f5f471dfae SHA-256: 4c706b828b642a5470aa8962597939292258b8e12446051f97258fb3699094c2
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly suggest it's designed to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/strik?utm_term=what+is+the+mass+of+a+plastic+spoon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453747/normal_6045e605abb15.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/pixepogunaxorivij9xeo2.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/fN9hiji/stickers_on_snapchat_blurry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470533/normal_605d6af7619a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_603127d481ad4.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/FGnjh9e/jaruwafulapa.pdfIn PDF document text
    • http://bighome.space/rekitobutu0a7rm.pdfIn PDF document text
    • https://cdn.sqhk.co/zeboxuze/ahiichf/dupogaxorotefowazemiwed.pdfIn PDF document text
    • https://cdn.sqhk.co/fabokofe/o54jcgK/xajozubasofobiditidajire.pdfIn PDF document text
    • https://cdn.sqhk.co/sutekepape/tham2jj/89837573644.pdfIn PDF document text
    • https://cdn.sqhk.co/lixabanitav/cgfyagh/27607781659.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/XifEcei/26458791808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370530/normal_601530762e896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_604ccb934655e.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/i3hjjga/last_of_us_2_wallpaper_for_phone.pdfIn PDF document text
    • http://powerpoint4you.ru/how_to_download_fonts_to_cricut_appm4qgt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nopizapokife.epizy.com/chromecast_device_not_found_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c7c0e5-bc71-457c-8666-0035bc61a7aa/samsung_wf210anw_xaa_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453b3893-4455-4e00-912e-e3adb69c66c6/63387827805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97378683-aec5-4310-8a59-294aa7f9dc7f/fezozezejaxesubexe.pdfIn PDF document text
    • http://zigevunagenape.epizy.com/37090964375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4db39de8-7347-4966-b32c-9ab100d3d008/87951512447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3c0516-1e7a-4e49-9025-1a9a6ee48918/list_of_greek_mythological_movies.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_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 5172 bytes
SHA-256: b7fb6a883ab8d3fb89a74127387204f2ce949d60cba0cf03e3869c23f7915db0
font_01_sfnt_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 10584 bytes
SHA-256: 003d83ab9ea64cf778f801fd0fd0902b5203e4efc1328484bed7ea55f876f482

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