Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb594b7c42342019…

MALICIOUS

PDF

80.8 KB Created: 2021-02-16 22:21:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 88cab28877f05da62c52087f93607d06 SHA-1: 0488746f70a852a7a6f1371747ebe83eba43e7d9 SHA-256: eb594b7c42342019667a7a570bf22e308f8113c5f9a3023275979c098541b176
136 Risk Score

Malware Insights

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

The PDF contains a high-severity heuristic indicating it's a phishing lure for a free download, linking to an external redirector URL. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI point towards a phishing campaign, likely using embedded JavaScript for redirection or further payload delivery.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/123?utm_term=kali+linux+beginner+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5fd16a0f82cce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_5fd82cf7b0421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_600fd2aa8d6ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489409/normal_600ea8a8c9051.pdfIn PDF document text
    • http://tameenegypt.com/nujubijojuwebegipmq7d.pdfIn PDF document text
    • http://iciapp.xyz/36643155726edqie.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/VQjije5/pakalexijexudafowokedi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366009/normal_60084c0037a69.pdfIn PDF document text
    • http://e-sparks.ru/motivation_letter_for_a_job_templateahbk5.pdfIn PDF document text
    • https://cdn.sqhk.co/dofubetu/fhdjiTD/turbo_league_discord.pdfIn PDF document text
    • https://cdn.sqhk.co/wanazofemuvu/yienjbX/transformers_earth_wars_omega_supreme_release_date.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367294/normal_5ff7db78b91af.pdfIn PDF document text
    • https://cdn.sqhk.co/tewisifupib/SPERjCw/93316557242.pdfIn PDF document text
    • http://steelsho1.club/pag_ibig_acquired_assets_2019_septemberuf84v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486042/normal_602405f66ca41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476941/normal_5fd043e019b40.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/fshaAgi/cross_colors_hoodie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481839/normal_5ff9cd07b8bd3.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/jbCgjvP/lebara_germany_mobile_data_not_working.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447098/normal_6003b5d418784.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 3996 bytes
SHA-256: ad5e7260279a82e259a492ec9294a049e8403546148476bd96fc9faa4a6f481e
font_01_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 5272 bytes
SHA-256: cc158fcac6b0e6e178effdbc49c329ade69c6ee3d943902b93108433eb0b60c1
font_02_sfnt_off00011286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 10152 bytes
SHA-256: 3192923794c12c31eaae7a66d81c499cd3b4b25c7198abab8180bec5d66e6473