Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fabc1114ae6366…

MALICIOUS

PDF

75.4 KB Created: 2021-03-11 19:39:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aee1201dd59d4df7e82690fed3dab58a SHA-1: 55ccf35d7982a1f2a46dd389b6cee049bf422788 SHA-256: b9fabc1114ae6366993d86fc88c075aadbcbf8fc560e1cd22e13e887acfff650
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 0.9996

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://seumenha.ru/wix?keyword=highland+climate+definition+geography PDF link annotation
    • http://instasale.company/kapevejiwxvj7p.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/lilizasixejoxoso.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/explain_the_meaning_and_scope_of_public_administration.pdfIn PDF document text
    • http://policyhelpcenter.com/michael_crichton_jurassic_park_book_reviewfab9z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471475/normal_5fc5ae1778c40.pdfIn PDF document text
    • https://cdn.sqhk.co/wabitakenina/jbgOEhb/64333214159.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/sistemas_del_cuerpo_humano_videos_para_nios.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/baguio_city_tourist_map.pdfIn PDF document text
    • http://xtreme-sport.ru/wagipipidunejanumumizufbpr7d.pdfIn PDF document text
    • http://golixudib.mypressonline.com/nanatatonigovunimad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530323/normal_5fc832f9e8211.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449603/normal_5fe020cee3f20.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/ficBhhQ/drum_set_for_beginners_price.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/65505931523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464532/normal_603607085bdc3.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/jagdgdu/wilderness_survival_shows_netflix.pdfIn PDF document text
    • http://lnstagramcentre.net/admindek_admin_template_githubtp1r2.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/fufevegekelajenidaraf1nn1s.pdfIn PDF document text
    • http://hugertely.xyz/mario_kart_8_iso_downloadqwfn0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369760/normal_5ffa73bae44b5.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/ctghjcp/card_collection_stores_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 5452 bytes
SHA-256: 979b5cf33859ef18628f7a8086f65f0841a387ddcc069b0788a3c4048b8c6805
font_01_sfnt_off0000fb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 10896 bytes
SHA-256: be6d70bd9906e70271d9da2db0e8f40adb316a4dc82bb6f91f538f21727241ff

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