Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9232e8c668ba66e…

MALICIOUS

PDF

72.3 KB Created: 2021-02-14 13:00:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 34200e1e2a66088caf19cb915d9fb58b SHA-1: d66bf4457fa8ea179ecafca624eaa76a163244ab SHA-256: f9232e8c668ba66effa753decc8bbe8f4bc4c91466d77284f0d1b4c14f0146cd
126 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 embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to a book title, directing users to external sites. The presence of multiple external URIs and the link farm heuristic indicate a strong intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://leonvi.ru/wix?keyword=dear+evan+hansen+through+the+window+book+pdf PDF link annotation
    • http://mkuu.club/80552480274b5nqz.pdfIn PDF document text
    • http://wide-mean.top/sapemaj2fmoo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454290/normal_5fdec8ad1e854.pdfIn PDF document text
    • http://gratoraama.website/after_2_libro_italiano_gratisbk8ch.pdfIn PDF document text
    • http://sale20.site/bujutovirebarao7taa.pdfIn PDF document text
    • http://repair-foto.ru/ge_electric_steam_clean_oven_instructionsxk7z4.pdfIn PDF document text
    • http://3bki.ru/car_racing_game_apk_offline445pe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460465/normal_6011c493a9ceb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479715/normal_5fc612c52e516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380530/normal_5fe75a215c468.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406229/normal_6009a9036ceb1.pdfIn PDF document text
    • http://alsamcctv.com/mojejigakawazs5i0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sujonereduvuk.rf.gd/74033431575.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/federal_reserve_balance_sheet_national_debt.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/sickle_cell_anemia_ppt.pdfIn PDF document text
    • http://bosirizowu.rf.gd/5003760223.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/new_hyperlipidemia_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/48784922249.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_off0000db6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 5628 bytes
SHA-256: 4d3225064aa4251ec5fc1ae13dac7c3de82fd5fcf061a14a9311e05712a7efde
font_01_sfnt_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 10316 bytes
SHA-256: 56c6030c902112508fbc56ce1d704f535971ae1b400eb7f53a84ae00ee05f59d

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