Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b6df13ed24fd5b…

MALICIOUS

PDF

71.3 KB Created: 2021-04-06 05:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4ec52b136f3eaaf8bd14ca5d7eab2437 SHA-1: 590e1c76a88e32cc470f99263ef9e7d06b9ea64a SHA-256: e2b6df13ed24fd5bc618e143f06d83227d57c75d10db37886128d485b3de3c0d
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://dafemum.ru/award?keyword=amoeba+zone+defense+pdf PDF link annotation
    • http://gosologesegob.iblogger.org/kadidavugusasojoga.pdfIn PDF document text
    • http://true-board1.club/xisijimuj2lr33.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/algorithmen_und_datenstrukturen_saake_download.pdfIn PDF document text
    • https://lavupujewefi.weebly.com/uploads/1/3/4/6/134631736/rutison.pdfIn PDF document text
    • http://familyit.info/wing_chun_first_form_step_by_step8frnw.pdfIn PDF document text
    • http://imkl-checker.com/dipudanejowigury759k.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/antibiotic_spectrum_of_activity_chart.pdfIn PDF document text
    • http://vegifeda.mypressonline.com/1274151971.pdfIn PDF document text
    • https://zudiwimuda.weebly.com/uploads/1/3/1/4/131438079/b7f3ec.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/3DEhgMk/65387376332.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/Ptgihi6/wigidif.pdfIn PDF document text
    • https://cdn.sqhk.co/vinogusi/ciihbgg/coin_master_free_cards_2019.pdfIn PDF document text
    • http://datingsexchat.site/how_to_learn_android_development_for_freejpnh7.pdfIn PDF document text
    • https://ginuzakonufa.weebly.com/uploads/1/3/2/6/132681862/02d3f147.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxowasone.epizy.com/nofizotijinewowekuxo.pdfIn PDF document text
    • http://fekobovovexi.epizy.com/tomaselikugeroz.pdfIn PDF document text
    • http://lavoxema.onlinewebshop.net/kibivasexefuni.pdfIn PDF document text
    • http://kutegabirena.epizy.com/maths_practice_worksheets_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b2f5a44-ce71-4c2f-a5fc-43d4b1c84df7/microbiology_textbook_for_mbbs.pdfIn PDF document text
    • http://kejefutipetube.epizy.com/ciencia_politica_adriano_gianturco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab9b2da3-5d15-46e3-91bc-3b8ba062528f/1812157602.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_off0000dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 5240 bytes
SHA-256: a17b5da9320028690c15593188c06783a97d1bb6c17923cfd9b86903996b3196
font_01_sfnt_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 10024 bytes
SHA-256: bbdce6bdea120f48d927a3efae2a20de38b4ea446c5360d814aee4ec4ce3dc5e

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