Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86555b3dbbdc974…

MALICIOUS

PDF

77.7 KB Created: 2021-04-05 10:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8e997574e029bbc7bb058497935c22f SHA-1: c8e33600dc452f914e6c25db8ac56a0f650c68de SHA-256: c86555b3dbbdc9749e992654d234158b0dcb9f262eda29036e1a2b7e9fb16799
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to PDF files hosted on various domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=que+organos+conforman+el+sistema+circulatorio+humano
    • https://static.s123-cdn-static.com/uploads/4456984/normal_5fdf56444a06d.pdf
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5fd8e37760686.pdf
    • https://gakafapokizi.weebly.com/uploads/1/3/5/3/135319358/997016.pdf
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/3936829.pdf
    • https://dowadumusisek.weebly.com/uploads/1/3/4/5/134521262/7c593.pdf
    • http://constructionhouse.info/25218211186puzcw.pdf
    • https://fabegobidik.weebly.com/uploads/1/3/1/4/131437275/ec89c8.pdf
    • https://cdn-cms.f-static.net/uploads/4379852/normal_602f80edbe35e.pdf
    • http://reduslim-officialsite.site/xonofivinozacfyg.pdf
    • http://goshop32.site/babosas_bajo_tierra_megamorph_slugsmljdj.pdf
    • https://negofajosodin.weebly.com/uploads/1/3/5/3/135314147/bapuk.pdf
    • http://smotrikino.fun/cortisone_injection_side_effects_insomniafwd9f.pdf
    • https://gamabisage.weebly.com/uploads/1/3/2/6/132681080/a8c1ade.pdf
    • http://fb-ig-violation.com/85325370587htwx6.pdf
    • http://agent-ritual495.online/ponajategiwazijudine44s4v.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xofalepelala/ap_style_guide_job_titles.pdf
    • https://s3.amazonaws.com/xakapudakadu/esquires_bedford_gig_guide.pdf
    • https://s3.amazonaws.com/xuzed/how_much_water_to_put_in_presto_pressure_canner.pdf
    • https://s3.amazonaws.com/zuses/67059582149.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_off0000ef6b.bin
0706a04d2fecc4300ca5277c0d676bf8886fd516f9d95823e717d8aa8970cdcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 5356 bytes
font_01_sfnt_off0001017d.bin
01ae8b32d197af07afb55b4bb4a70e2ef77d5df4e17982b73c2c4f2b4dc84dc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 11604 bytes

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