Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d9a3e066bdcb89…

MALICIOUS

PDF

77.6 KB Created: 2020-11-25 00:16:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 891a361186d1a914fa3091ddd3a62f76 SHA-1: 99c52ab6eef36224ecf35785a02c137f9d495f94 SHA-256: 09d9a3e066bdcb89a4a59c8b577e95725efcf10a4b8e2c584c5122cb51692309
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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/aws?utm_term=technical+requirements+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387411/normal_5f944e89e7e40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467573/normal_5fa46b9b9652b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420906/normal_5f9974b90e43c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418791/normal_5fa9bdc798c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f95768c0928a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5fa701ea2b8df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381762/normal_5f8f84bd3e258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_5fa3dd38c2f69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420470/normal_5fa2a7657637b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393908/normal_5fa254d2c3335.pdfIn PDF document text
    • https://laputamobo.weebly.com/uploads/1/3/4/7/134763437/913743.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/76269297534.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/12449552051.pdfIn 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_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 5248 bytes
SHA-256: da16b96ee13a30451e1541f68a456291d64c8f60efdcd088f24e10f5f5e811b5
font_01_sfnt_off00010684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 10312 bytes
SHA-256: 7dce442fb582409fcf66bec9ffc9babd945e206b8f463c57989bf73151c529bb

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