Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc8671490e3576d…

MALICIOUS

PDF

76.3 KB Created: 2021-04-08 01:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11224ebee6694d9eab3599fdfaf4cc52 SHA-1: 48b3d3bfcf31f05d6e21aa701ccadef21c11906a SHA-256: 9fc8671490e3576d57ce6fa1e9687af6661f86c812b1ba76514226880313fe90
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a suspicious domain, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect 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://midufefew.ru/strik?utm_term=venn+diagram+meme+maker+no+overlap
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/gogalisexe.pdf
    • https://cdn.sqhk.co/lojadisexudo/djaB9un/45187297530.pdf
    • https://telapawuwa.weebly.com/uploads/1/3/5/9/135964826/7469203.pdf
    • https://cdn-cms.f-static.net/uploads/4417406/normal_602da92813908.pdf
    • https://cdn.sqhk.co/vopunokapire/6chgeie/venejox.pdf
    • https://kazazurijufom.weebly.com/uploads/1/3/0/8/130814205/525551.pdf
    • https://cdn-cms.f-static.net/uploads/4385021/normal_60332799ed07f.pdf
    • https://cdn.sqhk.co/toralapiluw/JMajdyn/70422335490.pdf
    • https://cdn-cms.f-static.net/uploads/4404528/normal_6038c388e3147.pdf
    • https://gunobodupisar.weebly.com/uploads/1/3/4/6/134677737/2095316.pdf
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fceffca00093.pdf
    • https://cdn-cms.f-static.net/uploads/4450424/normal_6040fc4e639ab.pdf
    • https://jafiwivejo.weebly.com/uploads/1/3/5/3/135305612/5011281.pdf
    • https://domazatavaxagit.weebly.com/uploads/1/3/0/7/130775902/mepesipul_ruxodavop.pdf
    • https://cdn.sqhk.co/vegedusovo/Mtljahe/32494431200.pdf
    • https://cdn-cms.f-static.net/uploads/4476150/normal_6049e8e91fe2a.pdf
    • https://cdn-cms.f-static.net/uploads/4481662/normal_6041441b672cd.pdf
    • https://cdn-cms.f-static.net/uploads/4393353/normal_60290aa7c4e8c.pdf
    • https://cdn.sqhk.co/ditetona/hgx3Tjh/52011514646.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_05ba56ab2cf9438aa3e9d139218f2472.pdf?index=true
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_407293f0938244aba533ee68530865e2.pdf?index=true
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_3d253e6a20274af88358d157a8b46198.pdf?index=true
    • 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_off0000ebf0.bin
0da66a95e7946aa203c2d51796dd984b20792d4bd0d4d0333feac299728abc31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 5188 bytes
font_01_sfnt_off0000fd93.bin
bef4e544e4092dac7783384104bc426a3791a4c33bca3221d3c611fe9f23c6bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 11300 bytes

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