Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11c95ab9bcd3602…

MALICIOUS

PDF

75.5 KB Created: 2021-05-14 16:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a0c612a457cb32f51e35e594d97cc444 SHA-1: 7549b77642c01f0db1dbce00c7176641ce98a9b8 SHA-256: b11c95ab9bcd3602e425d650f06e4beab48cca179e365df1521ae20fbe4c74bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://pelibifir.ru/strik?utm_term=interior+design+masters+in+canada PDF link annotation
    • https://xuzubakew.weebly.com/uploads/1/3/0/9/130969304/kupijaza_karikojimesise.pdfIn PDF document text
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/7691115.pdfIn PDF document text
    • https://dovezoluwebib.weebly.com/uploads/1/3/4/0/134017866/viviriki.pdfIn PDF document text
    • https://tibanevugite.weebly.com/uploads/1/3/4/6/134655495/356dd9d4b.pdfIn PDF document text
    • https://wowobomufib.weebly.com/uploads/1/3/0/8/130874304/gekajeja.pdfIn PDF document text
    • https://getaforufuzok.weebly.com/uploads/1/3/4/7/134733873/438624.pdfIn PDF document text
    • https://ruweveti.weebly.com/uploads/1/3/1/3/131379789/8738542.pdfIn PDF document text
    • http://vazifesi.iblogger.org/8149402067.pdfIn PDF document text
    • https://bavovazekix.weebly.com/uploads/1/3/4/6/134696550/9563645.pdfIn PDF document text
    • https://lokulubebu.weebly.com/uploads/1/3/1/8/131856352/zoxof.pdfIn PDF document text
    • http://dumigegin.medianewsonline.com/48476855719.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/rational_choice_theory_book.pdfIn PDF document text
    • http://zozegakipuvi.iblogger.org/best_sanding_sheets_for_wood.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/xogik.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/student_engagement_in_the_classroom_examples.pdfIn PDF document text
    • http://dozirojaj.rf.gd/rezeridibinitetajezaluza.pdfIn PDF document text
    • http://nuvebabe.atwebpages.com/bma_wealth_creators_demat_account_closure_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/cover_page_design_for_internship_report.pdfIn PDF document text
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_05994b6037af4fa4ae834d7040b5acb0.pdf?index=trueIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_f2c8a5c4bddd4eea9c2b4326fa76a9f8.pdf?index=trueIn PDF document text
    • https://655b5f2c-2f45-4411-b579-7e5bd587bf3d.filesusr.com/ugd/2a272b_d51739a822a54e9bbd1e60e819e1e2bf.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_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 5164 bytes
SHA-256: 74ec0429d668f63fe588417b50945f32ef9efc37b34c14cc047831ab5b823a86
font_01_sfnt_off0000fc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0F 10584 bytes
SHA-256: 1e1fbecb94dec0d946e38c9fb54e4168207fdd7fa72b27a174edceab58791381

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