Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb8eb131969e807…

MALICIOUS

PDF

78.1 KB Created: 2021-03-19 12:39:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 30067e15fe50109696729f97c52e9d9a SHA-1: c94b673fe04e2bc2f88e0e20df74f5c2fc44386e SHA-256: dbb8eb131969e80781323886ea8f59d4bb99ca90190bbb99e43ebd73d234dc5f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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. The document body, though partially corrupted, suggests a lure related to the game 'Binding of Isaac'. The primary malicious indicator is the embedded URL pointing to 'midufefew.ru', which is likely used to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://midufefew.ru/wix?keyword=binding+of+isaac+afterbirth+plus+unlock+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369499/normal_5ff2ad6113b4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457560/normal_602605d9c4411.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/can_samsung_tab_4_charge_wirelessly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_601f6d72641f0.pdfIn PDF document text
    • http://nefupanono.mygamesonline.org/brother_printer_hl-2140_toner_cartridge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485172/normal_601e08a034d8b.pdfIn PDF document text
    • http://noxetoporobosek.sportsontheweb.net/el_alquimista_de_paulo_coelho_gratis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_7671961926b54acd9bc68c3e4a5d0b06.pdf?index=trueIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_e0848723a9d749d98f6d462cf3a55228.pdf?index=trueIn PDF document text
    • http://nosigegu.onlinewebshop.net/how_to_reset_voicemail_on_mitel_5312_ip_phone.pdfIn PDF document text
    • http://mujujilunel.epizy.com/ontario_college_of_teachers_application_form.pdfIn PDF document text
    • http://kemesuxaw.myartsonline.com/75097268926.pdfIn PDF document text
    • http://sexexunila.epizy.com/12972078176.pdfIn PDF document text
    • http://bugazepoja.onlinewebshop.net/34538082855.pdfIn PDF document text
    • http://lowavizoviwu.epizy.com/65409716881.pdfIn PDF document text
    • http://xatonerux.epizy.com/adguard_premium_apk_3._2.pdfIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_e0c9ac108a214390a53af7ae8eef9506.pdf?index=trueIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_b0d355bd529c40f79c11b63abba7c4c0.pdf?index=trueIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_cd34decf291c4d93b49985e2dcc57416.pdf?index=trueIn 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_off0000f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 5672 bytes
SHA-256: 458b513dfaf240f3bb61e38be5315e93c876e69ee6d167eb36280c9af2049d48
font_01_sfnt_off000105ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 10968 bytes
SHA-256: c039a8bb1696ed7c3500e10a320eb0ae93c2adbf4120af39ffbcc02426d9bed6

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