Malicious PDF — malware analysis report

Static analysis result for SHA-256 261e1d85a9d29baa…

MALICIOUS

PDF

77.1 KB Created: 2021-03-27 19:59:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 93e0a2d2d7265e3035b52374d4a598e9 SHA-1: d73740ff7e5aac5e01e35baf13c127dd00ccbf8e SHA-256: 261e1d85a9d29baa0a7ab47a0f92bcd168ed3bae91bcba80f7498f7cff9d7c98
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9993

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://leonvi.ru/123?utm_term=container+architecture+book+pdf PDF link annotation
    • https://cdn.sqhk.co/denepepunuja/giaggQ3/vijadodixobaxumuf.pdfIn PDF document text
    • http://sovetnik53.ru/adaptive_asset_allocation_a_primer0e1qy.pdfIn PDF document text
    • http://duvejiwuxikon.getenjoyment.net/leadership_styles_in_education_administration.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466135/normal_6056c312f1bbd.pdfIn PDF document text
    • http://degifutuv.scienceontheweb.net/93563458466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421966/normal_5fdbdb72f0ab9.pdfIn PDF document text
    • http://xivobivivupe.mygamesonline.org/bekidexokukabe.pdfIn PDF document text
    • http://hook-up.fun/fevibadijotedivagojufez36nng.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/gcIEXib/project_management_tools_microsoft_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/javijaxim/eJhjkjc/gotivuta.pdfIn PDF document text
    • http://persequen.com/72081685499sj1dl.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/compilers_principles_techniques_and_tools_solutions_to_exercises12x4i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_602ce5554eb32.pdfIn PDF document text
    • http://fulilip.iblogger.org/energy_losses_in_pipes_lab_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_5fd13ee0043ae.pdfIn PDF document text
    • http://dvestideyli.xyz/xexufojajuk1dgl.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/ef543b8f-db34-4593-820d-2549815fcaa3/no_te_metas_conmigo_traducir_al_ingles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e737450-1aa7-45a5-b9e0-f8bdff500ced/8145857182.pdfIn PDF document text
    • http://miwafugupek.epizy.com/bhagavad_gita_chapter_2_slokas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e3ed106-1b54-4644-aacf-e699bb68d88b/trane_xr90_pressure_switch_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/088c27f4-abae-4ee3-b649-a3849862826b/sherlock_holmes_books_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a0c3ad1-59bd-4e76-a4f8-c7529f76b3af/foucault_discipline_and_punish_essay.pdfIn PDF document text
    • http://givemuzod.epizy.com/jurokirokobero.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_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 5144 bytes
SHA-256: cd94fc7c002b14c485b1762e754b1ff044baeef237aabe14888eef05a3ecd49c
font_01_sfnt_off0000ffc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 11280 bytes
SHA-256: 23cef25324474ebadb1c7aa1a4ccd68ab32722369235bcf2722e118cb9b41009

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