Malicious PDF — malware analysis report

Static analysis result for SHA-256 6724d0beeb758c98…

MALICIOUS

PDF

85.7 KB Created: 2021-05-08 00:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5cf851d96d748dd9f0310957e56117ba SHA-1: 623ed18b48da7c710e6e0df21b1a9dbf994b4c73 SHA-256: 6724d0beeb758c98a0139e2c11adaf9b323cde3085c6578515bd0193f376eefc
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to obscure malicious intent. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document's content likely directs users to install remote access tools. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://seumenha.ru/strik?utm_term=how+to+workout+with+rubber+bands PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448976/normal_6010095cd3bb4.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/LjgKV4V/splashtop_download_personal.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/rvjfjeb/castle_story_game_mod_apk.pdfIn PDF document text
    • http://libifutolile.iblogger.org/86821806891.pdfIn PDF document text
    • http://sethel.xyz/luginigujaserubu8grnu.pdfIn PDF document text
    • http://arevakar-travel.com/xexakawaxifoso0idws.pdfIn PDF document text
    • http://xeresorejal.iblogger.org/lawiratetologuguzunawu.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/tabokoregageb_desegale.pdfIn PDF document text
    • https://cdn.sqhk.co/temududote/Fk1JjhD/iowa_custom_farming_rates_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/naruxibe/iUheJPV/vosekokevizilulamiguma.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/RjhOial/zugafujipizopusamegof.pdfIn PDF document text
    • https://nasovakuj.weebly.com/uploads/1/3/2/3/132303133/1192614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419623/normal_6013c3ef51c38.pdfIn PDF document text
    • http://small-italy.space/african_proverbs_quoteschvwg.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://jeludugaj.epizy.com/fairy_tale_picture_books_for_preschoolers.pdfIn PDF document text
    • http://bijalefopate.rf.gd/love_you_big_sister_quotes.pdfIn PDF document text
    • http://xovijoj.epizy.com/mujonigepovezidijaxepa.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_off00010655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 5020 bytes
SHA-256: fb74c49b01861755bbd8e23c9964389532c768d81c73544276b55c24687d077c
font_01_sfnt_off00011763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11763 10564 bytes
SHA-256: ab22c47609ab59450dc7c20a64fd0cc48b09fde36bca7b22286953cfd5e50eae
font_02_sfnt_off00013b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B84 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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