Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6058a50c49acc66…

MALICIOUS

PDF

70.5 KB Created: 2020-11-12 21:34:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1e4ba5706d70953738069c2965fa9f9 SHA-1: d2ae64010b7f64b9304db2c7d94ac48fc828e920 SHA-256: b6058a50c49acc66a1b541635c4d4c5b0ad5e37988980cd1c6ff192af51604ed
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to external PDFs, suggesting a link farm designed to manipulate search engine results or distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://traffmen.ru/aws?utm_term=yealink+w52p+datasheet+espa%25C3%25B1ol'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/aws?utm_term=yealink+w52p+datasheet+espa%25C3%25B1ol
    • https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/8165944a377.pdf
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/kuvoguji-sexisevavumig-guxujafam-sotisesafutule.pdf
    • https://cdn-cms.f-static.net/uploads/4423757/normal_5f9ac42bacdc9.pdf
    • https://komolelavox.weebly.com/uploads/1/3/4/5/134518501/kajuku.pdf
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f87b6cbefc4c.pdf
    • https://resedofuza.weebly.com/uploads/1/3/4/5/134503764/lomiwubimime-fotewag.pdf
    • https://fikugutadopoxas.weebly.com/uploads/1/3/4/3/134340330/ef105f129364f9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4b2c841d-7f49-4893-b278-4c3449f6e933/kojugivopijezi.pdf
    • https://uploads.strikinglycdn.com/files/2f09186e-76be-476a-9dce-a451a4929da1/41295111358.pdf
    • https://uploads.strikinglycdn.com/files/b9353e09-7133-4b4f-988b-8f9b83192378/steven_francis_pavic_released.pdf
    • https://uploads.strikinglycdn.com/files/9741e2f1-ee0f-4dca-8fd7-ac3fa7116f3e/61266260488.pdf
    • https://s3.amazonaws.com/lorifawuvawot/dapukovuzukasij.pdf
    • https://s3.amazonaws.com/vuxalirudidel/mafas.pdf
    • https://s3.amazonaws.com/figugipopar/vujetanal.pdf
    • https://s3.amazonaws.com/mafavuzenoliki/16173028975.pdf
    • https://uploads.strikinglycdn.com/files/b486a35d-72dc-4343-9639-0a275893ae20/numeset.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_off0000cc26.bin
42150af702e8b94ebe3e5b38240faf12aab18d634d0a276f4e807ce1d7701c9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC26 5536 bytes
font_01_sfnt_off0000ded9.bin
8f5d8b7dae1e2dcc00973541ea1f1d3d47b054fbf1258b098955f01596c6be13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED9 14112 bytes

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