Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e0a57bf76a1df6…

MALICIOUS

PDF

78.9 KB Created: 2021-03-24 11:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 17d8b5d699e4963e4c8f63e0d3000388 SHA-1: 15d16075b8b0ccce7cda3988c5196a3a8bf2fa74 SHA-256: c9e0a57bf76a1df6fa5e8ae5b03ca375648ebbe0dc89fa2fada2db877e2a2faf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://xajibur.ru/wix?keyword=online+course+introduction+sample PDF link annotation
    • http://terem.space/logunonojazifotifuzuj95h1p.pdfIn PDF document text
    • https://lirobepofuneve.weebly.com/uploads/1/3/0/7/130740173/8953293.pdfIn PDF document text
    • http://firstreadersclub.com/lights_out_breaking_benjamin_lyrics_meaninggkpz7.pdfIn PDF document text
    • http://yildirimotobursa.com/83665727316j92wx.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/racing_city_3dg0h7c.pdfIn PDF document text
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/lovonapem.pdfIn PDF document text
    • http://solent.bar/zofosizosebavulodugenivkoiw8.pdfIn PDF document text
    • https://zubotovilep.weebly.com/uploads/1/3/4/5/134581484/6461019.pdfIn PDF document text
    • http://bu-markett.com/a_streetcar_named_desire_analysis_scene_114nud4.pdfIn PDF document text
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/1784679.pdfIn PDF document text
    • http://zuvabefip.22web.org/how_to_remove_grease_from_microwave_filter.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/software_architecture_diagram_iconscq3y8.pdfIn PDF document text
    • http://flowerport.market/badiradijukotuvitijaxonadb9wo.pdfIn PDF document text
    • http://rusakova.space/216547930190zv5y.pdfIn PDF document text
    • http://vezdesami.ru/rikalumuzec4cq4.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/33e9fbc6-05a8-4af3-b6c7-6eb05f7757c8/lost_books_of_the_bible_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea55f05-f9eb-4ae0-85f5-422625229017/41637732741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3887504-b643-4ad5-8405-ae5da217218c/how_do_i_unlock_my_nortel_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b3600d-5798-4d6c-b076-a32edbe6e568/best_app_to_learn_klingon.pdfIn PDF document text
    • http://budobilososuw.rf.gd/vshare_helper_for_windows_7.pdfIn PDF document text
    • http://renureva.epizy.com/15279532213.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_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 5248 bytes
SHA-256: 9d2c7dbc077f94a8793f2294875a0b384f81599708ea17a294e3e194896659eb
font_01_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 11196 bytes
SHA-256: a3e411b98c2efe9600e6bb54afd7edcbfc3ae4bfa70a6c9f1f14762072f622e0

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