Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9d2a57df7b88b7…

MALICIOUS

PDF

78.0 KB Created: 2021-03-10 19:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2afb40e4a5f3a2ed8a237d8dfddafbbd SHA-1: 18053a9c119c7c563aac54376e5a2b3392fc6677 SHA-256: cf9d2a57df7b88b7b6557ee06672656f9ac747069493a456423737f698831e60
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/aws?utm_term=best+weight+loss+exercise+routine+for+beginners
    • https://cdn-cms.f-static.net/uploads/4468812/normal_6011e1244ee22.pdf
    • http://gugolufixa.mywebcommunity.org/procreate_app_for_windows_free_download.pdf
    • http://vomimaforotagi.mywebcommunity.org/apa_ethical_guidelines_for_research.pdf
    • https://cdn-cms.f-static.net/uploads/4421329/normal_604391c7da2e1.pdf
    • https://jepemanek.weebly.com/uploads/1/3/4/5/134589705/dc204677.pdf
    • https://cdn-cms.f-static.net/uploads/4376870/normal_603bfbf089b71.pdf
    • https://cdn-cms.f-static.net/uploads/4380392/normal_6025098562d70.pdf
    • http://gowanenutik.mypressonline.com/the_wave_arizona_tour_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4444882/normal_603c23201e442.pdf
    • http://wirufebo.22web.org/76663124691.pdf
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5fd1e0f1d4815.pdf
    • https://static.s123-cdn-static.com/uploads/4446395/normal_5ff9aaf3f1111.pdf
    • http://torevifij.iblogger.org/printable_math_facts_worksheets_3rd_grade.pdf
    • https://cdn-cms.f-static.net/uploads/4450259/normal_5fe85289dad9a.pdf
    • http://soxiwokix.iblogger.org/20509411677.pdf
    • https://biramufon.weebly.com/uploads/1/3/4/7/134775887/08d235c38ad.pdf
    • https://cdn-cms.f-static.net/uploads/4403128/normal_601d9ab778176.pdf
    • https://static.s123-cdn-static.com/uploads/4490918/normal_5fefd01fbf542.pdf
    • http://sojuvofud.22web.org/enterprise_software_industry_report.pdf
    • https://cdn-cms.f-static.net/uploads/4473642/normal_6020a3ae95520.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://litorow.myartsonline.com/visual_studio_ultimate_2013_product_key_msdn.pdf
    • http://dapunujunet.epizy.com/32351343384.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f26a.bin
94993f1ee3098d00540170d9fbb1f8c20da6b1f74ffca6837db70cd95f21ee47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 5284 bytes
font_01_sfnt_off00010487.bin
423a7031a9ed4e9732ab580d33ca865e1652ef9bcb619d714484f27b6e7a5bd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 10984 bytes

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