Malicious PDF — malware analysis report

Static analysis result for SHA-256 deaa70b5247e4412…

MALICIOUS

PDF

72.8 KB Created: 2021-02-28 13:54:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 16e384bb0c8caaa9ed7d5dce2eb101f6 SHA-1: 5f5e6354348f050e232fe88f6c58ab4461d1053c SHA-256: deaa70b5247e4412e1f5c64b06a286c5386b519535efc76660da9282a2b57582
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The primary URL, https://jacksth.ru/strik?utm_term=royal+mail+international+address+format, is likely part of a phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/strik?utm_term=royal+mail+international+address+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413370/normal_6009c5ed91efb.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/eiVhehg/duxuwop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404959/normal_5ffdb4c2e43d8.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/dhihijm/dragon_ball_z_stick_fight_game_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/gidetixi/hcijhjd/pyramid_run_free_download.pdfIn PDF document text
    • http://tupuwuwegidava.22web.org/sql_database_viewer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385862/normal_5ff338452ee12.pdfIn PDF document text
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/e90b270c394.pdfIn PDF document text
    • https://filofasifujutoz.weebly.com/uploads/1/3/0/8/130874575/6273236.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/jdTagdh/51427736841.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365546/normal_600751cf83466.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409801/normal_6002aa824342d.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/9538672.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/hegfvib/president_2020_election_popular_vote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_5fd6452abe5b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417327/normal_5fc9fbf62e4dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukatotapi.epizy.com/esia_screening_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/99408508264.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/68510898582.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/can_teeter_hang_ups_help_sciatica.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_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 5164 bytes
SHA-256: 8fd796bf9c6734135955729778234433c063ed855d4f386eb879b19a23f494eb
font_01_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 11188 bytes
SHA-256: 13a702667648f0407332eeaf082c91ceac1b85545089ee58a2664cbcea0417f3

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