Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3ca8fc9a790eff…

MALICIOUS

PDF

74.7 KB Created: 2021-03-28 21:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4e7956e2688b22a305002e07ff90a111 SHA-1: 7b8e0f7adc0a2cd8617452f8fc9a7a6ad6982d63 SHA-256: 5f3ca8fc9a790effefc6ea85c16db96d9eb0781a1bf9cfe2e145616062012aa2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://jacksth.ru/award?keyword=deloitte+advisory+services+pdf PDF link annotation
    • http://govejulij.22web.org/lubejerefirewijejeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_60170945d5fe4.pdfIn PDF document text
    • http://nupubidodeje.22web.org/1987543235.pdfIn PDF document text
    • http://benunirudid.iblogger.org/rufajun.pdfIn PDF document text
    • http://mamivadusijuf.iblogger.org/pilifob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478669/normal_603169e898f94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_602592780f22c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477626/normal_5fd2fabaa06e8.pdfIn PDF document text
    • http://sagebiwepul.22web.org/kitchenaid_stove_top_kettle_uk.pdfIn PDF document text
    • http://zetomanebegox.iblogger.org/1637091122.pdfIn PDF document text
    • http://guromufupadaf.iblogger.org/factorytalk_view_se_login_macro.pdfIn PDF document text
    • http://pigetubivefenux.22web.org/84474849767.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rigatage.epizy.com/the_house_of_the_spirits_movie_youtube.pdfIn PDF document text
    • http://rovafitazilom.epizy.com/chura_ke_leja_song.pdfIn PDF document text
    • http://rutuber.rf.gd/27181564105.pdfIn PDF document text
    • http://bixutiwizofij.epizy.com/79523156795.pdfIn PDF document text
    • http://mepenaxuwijun.rf.gd/used_ansul_fire_suppression_system_for_sale.pdfIn PDF document text
    • http://ratesedefavure.epizy.com/elementor_import_template_to_page.pdfIn PDF document text
    • http://timidomefiwow.epizy.com/40157628361.pdfIn PDF document text
    • http://kogobobud.rf.gd/4340290730.pdfIn PDF document text
    • http://gaviguxugopa.rf.gd/university_admission_letter.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_off0000e4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 5312 bytes
SHA-256: 6a02fa8ac5de7e35cbcac817c880a9c8c81da354a51ea50245f868efa022344b
font_01_sfnt_off0000f701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 11320 bytes
SHA-256: 6f7fcf63d615210310b1f58d2265671a28662c5d435d902771141da7044e5fdd

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