Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4a3eafa99bd2b4…

MALICIOUS

PDF

82.6 KB Created: 2021-05-24 15:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4b54af347968f41bb774949a1f3049cf SHA-1: dae5424b2abb616305ec986e36086712e292521d SHA-256: 5a4a3eafa99bd2b4da4bea07f6a5c8b632ba72a547a16d4b9ce0a1c211f9c110
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDF files, suggesting a link farm or redirection scheme. The presence of a URL related to 'brawl stars mod apk' indicates a lure to trick users into visiting malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://crophysi.ru/strik?utm_term=brawl+stars+mod+apk+android+1+2020 PDF link annotation
    • https://sasanufodokedu.weebly.com/uploads/1/3/0/9/130969760/3575539.pdfIn PDF document text
    • https://panasijizikefiz.weebly.com/uploads/1/3/4/4/134446590/sadepep-zegavaxuvumale-vavipamakovepe-kibevifujojubo.pdfIn PDF document text
    • https://ruregojuze.weebly.com/uploads/1/3/2/8/132814589/dce657bf53ba8cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392652/normal_6048a918c1c6c.pdfIn PDF document text
    • https://wamonudikiso.weebly.com/uploads/1/3/0/7/130776885/mikazeju.pdfIn PDF document text
    • https://joxipoxojig.weebly.com/uploads/1/3/5/9/135956636/viwaf-mabexaviwat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408460/normal_602c80659ae0b.pdfIn PDF document text
    • https://konegodifoxud.weebly.com/uploads/1/3/1/3/131380175/4407050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_601260252512f.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/zapop-vezabanomatox-maravewasufeg-kutepesipa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478125/normal_5ff047cd1fc74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384036/normal_5fdf723a1d4dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/all_souls_cemetery_northfield_ohio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8dce8b1-4c52-4376-b8f5-14b6889a13f9/hp_envy_4500_driver_chromebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c625102-e47a-4f9a-8a5f-6a544f4937b4/ligizaketurazegagib.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/82073550173.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/experiencing_architecture_chapter_3_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/mefepewaxido.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/adform_javascript_api.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/34516577807.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/losalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a7a9aa-d267-40a8-af0d-5e06cd967791/28576518579.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/tom_clancy_books_jack_ryan_jr.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 5636 bytes
SHA-256: 0421743954afbcc5a326f721104c1031edceff8df7eac875e7beb169b4726c5f
font_01_sfnt_off0000ff23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF23 11692 bytes
SHA-256: dd40f36b72ced445bd74d80d04602c8c0e847bef511434f93db7b32147a5c36a
font_02_sfnt_off0001252d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252D 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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