Malicious PDF — malware analysis report

Static analysis result for SHA-256 b509df86a2d222f6…

MALICIOUS

PDF

69.2 KB Created: 2021-02-23 21:38:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a40b6952ef07dd06d92ece424d4367a3 SHA-1: 2fdf643bb54d2bc13c01946bdc5781abb23ee8e1 SHA-256: b509df86a2d222f65545ac216611320aef779b08027b0e347dabba1ce8bf44e3
156 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to Weebly-hosted PDF files, suggesting a link farm or SEO manipulation tactic. The document body, though partially obfuscated, references 'Dragon Ball Z Fierce Fighting 6' and authoring tools, likely as a lure to attract traffic to these external sites.

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://seumenha.ru/wix?keyword=dragon+ball+z+fierce+fighting+6 PDF link annotation
    • https://zopupafi.weebly.com/uploads/1/3/1/4/131454349/419799.pdfIn PDF document text
    • https://mesikanuxiruk.weebly.com/uploads/1/3/1/6/131636832/fa0cc2e10c8957.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/949ec09213bb.pdfIn PDF document text
    • https://revegeworosopo.weebly.com/uploads/1/3/1/6/131637057/jigesuxod.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/mawajajuxokepukuzusi.pdfIn PDF document text
    • https://totaguzoxexidi.weebly.com/uploads/1/3/2/7/132741029/5c5ca6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425919/normal_5fcf17bad4b94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_6013dc4494c82.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/risisipajole/6445176757.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/introduction_to_mathematics_book.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/23330524880.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/nigiwogimekopiweduvulidi.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/cftc_form_dcm.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/zibejowufunevabetenexix.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/3263621123.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_off0000cd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4A 5308 bytes
SHA-256: f330f6688496cdfcbaa487a22e46abd88403500a4d70bc795468332fff205024
font_01_sfnt_off0000df6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 15260 bytes
SHA-256: 22ac8033ecd46cd6bab686194a627c706a70ec4d95887398cf485adbf395616b

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