Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec42c8cc85bfe81…

MALICIOUS

PDF

57.9 KB Created: 2020-11-24 13:29:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 353737b7113f662a4380ce6957bd6523 SHA-1: dbc0af332491774f4202e09a6b52584a2841ecd8 SHA-256: 5ec42c8cc85bfe816b1c62902dd158eb69ebc50b819b137c85993de7b093cc83
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://trafffi.ru/strik?utm_term=koe+no+katachi+sub+eng PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402520/normal_5f9623e6bd98f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_5f95b01ea3a19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384154/normal_5f9e3c76f1525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404502/normal_5fa4730cd29f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f9489faf0516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5faf11851173b.pdfIn PDF document text
    • https://jokuvaput.weebly.com/uploads/1/3/4/5/134589987/papuloped_ludadunewemaxop_wafuro.pdfIn PDF document text
    • https://movidotibapokab.weebly.com/uploads/1/3/4/2/134265591/rezevawobi-buzud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_5fba10426edac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403264/normal_5f925b244ea83.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/tovakuboxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_5fa5f04c1e9ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000a960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA960 5104 bytes
SHA-256: 60ce574ff2a6ffac12ba70aca9206298ed80d9d9501381d619f41d61dbc2e979
font_01_sfnt_off0000babf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABF 9496 bytes
SHA-256: 393a895fdf4bdb17f51022cf2f823926cb4efae978f29b5a846ae8e45ef65543