Malicious PDF — malware analysis report

Static analysis result for SHA-256 2233ac8b3a7eb24f…

MALICIOUS

PDF

71.9 KB Created: 2021-02-11 17:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: adcde016f750a8e62b11d2ea8474ea1f SHA-1: 54d9f8e940c63f490d27a1bbb733e6fdda9505f8 SHA-256: 2233ac8b3a7eb24f441db44923a84637ec9e781ef3201451ee2e617dca70919f
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a significant number of embedded links, with several pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a campaign to manipulate search engine results or distribute further malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or redirection tool.

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 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.
  • 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://yafferge.ru/wb?keyword=browser%20survival%20games%20no In PDF document text
    • https://cdn.sqhk.co/dodirorip/jibhagd/xonulepetowawitevavul.pdfIn PDF document text
    • https://cdn.sqhk.co/karopepagu/i9icjdv/strategic_thinking_books.pdfIn PDF document text
    • https://kevelowomovozi.weebly.com/uploads/1/3/4/0/134012304/navomeruxogif_luwopemimaza_zetav.pdfIn PDF document text
    • https://cdn.sqhk.co/nepusoliweda/REeic4X/megunegomad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450509/normal_5fe23b4c2530b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492281/normal_5fd326353610c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368478/normal_5fef4c552415d.pdfIn PDF document text
    • https://fugomunufu.weebly.com/uploads/1/3/4/5/134586131/vubonope.pdfIn PDF document text
    • https://funemozivadomuz.weebly.com/uploads/1/3/1/3/131398429/b61e1d5c37a6e.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/LjbiaKg/tudopepiroke.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/gowupuzokowuxes/keynote_template_minimal.pdfIn PDF document text
    • http://zotibulavozixu.rf.gd/kali_linux_version_2019._1.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/buzagumetuledenimavuk.pdfIn PDF document text
    • http://jajoxutevo.epizy.com/linux_android_sdk_tools_install.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/html_email_format_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/rixulowosapi.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/xuguminazef.pdfIn PDF document text
    • http://fegugeg.rf.gd/bangla_job_application_letter_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/sudowipigozipobaloti.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/setamobetaluf.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/bambukat_full_movie_720p.pdfIn PDF document text
    • http://witopovuketoj.epizy.com/25575780908.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_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 5208 bytes
SHA-256: 0632a8624a6386bd585d28710554c22849b01fbe8db023cb8f2dbbc9ee3c7bd2
font_01_sfnt_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 10576 bytes
SHA-256: 21d8cdda8c707f50d8e1825924b2b888f4486d782b4525071a8b98f5939c0dc6

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