Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67b08ce0bf81ef1…

MALICIOUS

PDF

88.9 KB Created: 2020-11-16 19:58:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 76cb4f797a30ae6a4a28c133a8d8e939 SHA-1: db2eb8d8885a5acc6b9d7bf7378719f78095bf9f SHA-256: e67b08ce0bf81ef1b202e68655da53bb7229f85b455a6fd1174033d810777ae2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign educational content, but one prominent link to 'traffking.ru' is suspicious. The ML classifier and ClamAV both flagged this PDF as malicious, suggesting it's designed for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/strik?utm_term=no+man%2527+s+sky+freighter+cost PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492918/normal_5faffc7c9fe99.pdfIn PDF document text
    • https://kudipunebux.weebly.com/uploads/1/3/4/5/134509365/6f80d3ab3f3618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_5fb044e5e5ab6.pdfIn PDF document text
    • https://zemaxuwoti.weebly.com/uploads/1/3/4/6/134694437/580963.pdfIn PDF document text
    • https://bowiromifax.weebly.com/uploads/1/3/4/6/134613330/25a4eb61d.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/kakekojezutok/algorithme_exercices_corrigs.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/vivozewinisexare.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/xaxugozofizibepu.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/xasitegob.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/brainpop_acceleration_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/rutojo/arnold_schwarzenegger_height_and_age.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/cabinet_ministers_of_india_in_hindi.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_off00011d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 5432 bytes
SHA-256: 79e5bb518118da8e5369dd989bba5439bbbff94b0c4f36bef27c8bd6207f34fe
font_01_sfnt_off00012fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD3 12140 bytes
SHA-256: b6c52ffb18323717542d0b9a83c633ecb00967def4fe62da81cfe76242702728

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