Malicious PDF — malware analysis report

Static analysis result for SHA-256 435f2be4cb9cbbba…

MALICIOUS

PDF

72.6 KB Created: 2021-02-21 10:34:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7964fc3dfeb3219f4350e617010b617f SHA-1: 9a06f5a2f0e4b9ba788534b0034d2e5d5def2c93 SHA-256: 435f2be4cb9cbbbafc214358b97dc8b3591bbfaf7df2c6b810b72f41ad120f62
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 0.9997

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://druttle.ru/123?utm_term=is+honda+pilot+reliable PDF link annotation
    • http://gegapaxibu.22web.org/m_a_pass_movie_moviescounter.pdfIn PDF document text
    • http://sparzha.club/kanchenjunga_assamese_movie_song_asomi._inm1lvi.pdfIn PDF document text
    • https://dofolemabumef.weebly.com/uploads/1/3/4/4/134458616/4250972.pdfIn PDF document text
    • http://agent-ritual495.online/lynx_lake_lodge_for_saletwgpz.pdfIn PDF document text
    • http://good-production20.site/benetton_f1_logosd3jj.pdfIn PDF document text
    • http://keto-s1.com/kalezokimexudosg49e.pdfIn PDF document text
    • http://autoport76.online/driving_school_2016_hile_android_oyun_club11grr.pdfIn PDF document text
    • http://nigoviwan.22web.org/niv_study_bible_meaning.pdfIn PDF document text
    • https://nugaridepi.weebly.com/uploads/1/3/4/4/134474671/totesujisore.pdfIn PDF document text
    • https://sexanugujox.weebly.com/uploads/1/3/4/2/134266496/ludebupugomu.pdfIn PDF document text
    • http://zdsshop.top/795240763263j41k.pdfIn PDF document text
    • http://italywow.space/chapter_10_endocrine_system_study_guide_answers2flxg.pdfIn PDF document text
    • https://karujelibofab.weebly.com/uploads/1/3/1/4/131406149/sexuzaviga_jikudifu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375195/normal_600591d08ff32.pdfIn PDF document text
    • http://1fps.ru/285221428247ic9h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jarifixe.epizy.com/bedifit.pdfIn PDF document text
    • http://maviwapas.epizy.com/bike_racing_3d_hack.pdfIn PDF document text
    • http://dizavinizekabos.rf.gd/how_much_money_does_a_netherland_dwarf_rabbit_cost.pdfIn PDF document text
    • http://nuwumunis.epizy.com/67939483380.pdfIn PDF document text
    • http://pusevim.epizy.com/android_app_disable_auto_rotate.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EA 4912 bytes
SHA-256: 69e968e33b0ec395c28d129cf0c9a8ae6415af5d291e46f9516a557e2e9691c0
font_01_sfnt_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 10728 bytes
SHA-256: df3b6a3d765d7ea920870f7aef61813a891be45961c83a1d5d057b358e4c6aab
font_02_sfnt_off00010733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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