Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fa09f00d127d00…

MALICIOUS

PDF

83.8 KB Created: 2021-04-13 17:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 26920a119239fd7e1c9e9c8adcc94c80 SHA-1: 21251f1f2cd2e76ef5afd093d81ef96ac5ccf22c SHA-256: e8fa09f00d127d008e15c5f58df28d21f1f5abd4289c0ef85ce06359689b7c7e
126 Risk Score

Malware Insights

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

The PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or redirection scheme to deliver a malicious payload. The document body, though heavily obfuscated, appears to be a lure related to the theory of evolution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=what+happened+in+the+theory+of+evolution+summary PDF link annotation
    • http://nituzovido.getenjoyment.net/persian_language_course_in_urdu.pdfIn PDF document text
    • http://palifagumelu.22web.org/12911257179.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/characteristics_of_a_servant_leader.pdfIn PDF document text
    • http://rollernefrit.xyz/gevakovonoakkp8.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://ruvinowuge.scienceontheweb.net/memoje.pdfIn PDF document text
    • http://fudutotiv.iblogger.org/count_on_me_uke_chords.pdfIn PDF document text
    • http://hytri.com/theme_of_sight_and_blindness_in_oedipus_the_king1v0m5.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/lusawovomotirogekepusewe.pdfIn PDF document text
    • http://rerokofige.iblogger.org/58722162539.pdfIn PDF document text
    • http://generalmassage.online/closing_account_email_templatedjzvv.pdfIn PDF document text
    • http://kayikciakademi.com/allure_report_maven_commandn0608.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dec92401-cc83-4a73-bf9c-c5e7ef8219c7/muzodiraxugosiretakezet.pdfIn PDF document text
    • http://fuxatigapisi.epizy.com/xabezejen.pdfIn PDF document text
    • http://pofijiserige.onlinewebshop.net/17913007996.pdfIn PDF document text
    • http://mawokale.myartsonline.com/16871941570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15fa8f19-b643-4372-843d-0c9a0403aebf/what_is_the_membership_fee_for_planet_fitness.pdfIn PDF document text
    • http://kepawomokatuke.myartsonline.com/falalixopatetumolerel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e144f8d-d2de-48f5-9504-80642da404e7/68499408774.pdfIn PDF document text
    • http://pufawalaxovosi.epizy.com/antrenmanlarla_geometri_3.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_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 5456 bytes
SHA-256: 2ac865a5229a2900f8844e3ae96c4eb5b35af897ec49bdd324bd364322c123b6
font_01_sfnt_off00011dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEA 10644 bytes
SHA-256: 96aac9ec16ddc0b2923bacc1a0d006ef1b06a9361564ff79e9e409f38aac911d

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