Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ae745da8df6584…

MALICIOUS

PDF

77.4 KB Created: 2021-03-13 22:13:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0ec5eb42593e9ab55e10672014b8b541 SHA-1: b27484067f2f8280725a7f84fe27a6994cc63bee SHA-256: 11ae745da8df658433b9bcb10b87314153d9f4e9098347773fe21665e50eb889
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded URLs, such as https://dafemum.ru/strik?utm_term=emerson+tv+lc320em2+remote, strongly suggest a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to lure users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/strik?utm_term=emerson+tv+lc320em2+remote In PDF document text
    • https://wifovusu.weebly.com/uploads/1/3/4/3/134312249/8017223.pdfIn PDF document text
    • https://cdn.sqhk.co/gegojagakexu/cgjigja/samaxanowibi.pdfIn PDF document text
    • https://jatufajikovuna.weebly.com/uploads/1/3/4/7/134719937/61906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382771/normal_604bb25e56398.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367923/normal_5ff92e17a6348.pdfIn PDF document text
    • http://deladinabixek.sportsontheweb.net/7273495684.pdfIn PDF document text
    • https://cdn.sqhk.co/nezazexador/ggjebll/93382866791.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/the_collector_marvel_wikipedia.pdfIn PDF document text
    • http://kolunikikirade.22web.org/how_to_setup_wifi_on_ingenico_iwl250.pdfIn PDF document text
    • https://nipezititixi.weebly.com/uploads/1/3/4/6/134688951/jigoregiwozaf.pdfIn PDF document text
    • https://nubonikajifubi.weebly.com/uploads/1/3/4/8/134882340/370019.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/bozesunoveliravux.pdfIn PDF document text
    • https://torejijifixoni.weebly.com/uploads/1/3/5/3/135335296/wazefizuw.pdfIn PDF document text
    • https://cdn.sqhk.co/rodisukipi/fhhHger/50960108606.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xidutukas.epizy.com/47770670223.pdfIn PDF document text
    • http://nivuzujanux.myartsonline.com/canela_de_velho.pdfIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_63e28a0136994291b4c3ca00073bb415.pdf?index=trueIn PDF document text
    • http://surobufalinaxis.epizy.com/23254790852.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_453e97c8a402411a8d872d08c355e3c0.pdf?index=trueIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_c7672a10dce24b79ac66d7a1314d882e.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_9da24ff3c90d401583fd032012bd39c2.pdf?index=trueIn 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_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 5188 bytes
SHA-256: 551eed697a9c2788b385885a8abdaaad505fa1efe031fbecb0884fe38d809d78
font_01_sfnt_off00010442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10442 10532 bytes
SHA-256: bbadabf290a192bf7f7ecfbb4339ccc2da5642cc0d1c4decd715b7c3e357c75c

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