Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab75d28a549c807…

MALICIOUS

PDF

79.9 KB Created: 2021-03-16 04:11:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d3b55d04c1f2d8919038f096b7e4ba67 SHA-1: 131dd04afce51f0dfa57bc446397c22d3d146ddb SHA-256: 6ab75d28a549c8070a7ef90bb8c918533283e1e334b13ba8ab73c58a5ef47b8b
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm designed to drive traffic to malicious sites. The heuristic 'SE_INVOICE_LURE' indicates the document uses deceptive language to encourage user interaction. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pelibifir.ru/123?utm_term=full+cycle+accounts+payable+process+p2p+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5fe94e49e505f.pdfIn PDF document text
    • http://gezepopexu.iblogger.org/much_ado_about_nothing_annotated.pdfIn PDF document text
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/bf85c712ca83a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_6014a5f8c3d32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529024/normal_5fe4b364b51d9.pdfIn PDF document text
    • http://detonic-deutschland.website/sufuruvapeleznaey.pdfIn PDF document text
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/7589548.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420752/normal_5fdf20514981a.pdfIn PDF document text
    • http://antinomi.design/gevebutumulupafd0wb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416805/normal_5ff115ed6a575.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473432/normal_5ff1193ab87a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500430/normal_5ffc56cf43ca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393356/normal_5fd1186383f25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421957/normal_5fd8b17cc835a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://segidamilezuv.epizy.com/kezewirib.pdfIn PDF document text
    • http://kababotatage.epizy.com/webomodokisudamenevapaz.pdfIn PDF document text
    • http://vadupeti.epizy.com/canada_red_cherry_tree_information.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 5476 bytes
SHA-256: 490a80ed4153311c073009a9a20561e78d3c6d7dd4ca75d806d776be667bee0f
font_01_sfnt_off0000f7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 10832 bytes
SHA-256: 20cf62adcb7ea2a6a43e48ec9f928898b8a555f29d5974cbf692b0e3be2de906
font_02_sfnt_off00011cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF8 16224 bytes
SHA-256: b422167e406e14456d8c777e36f465b0cf7a3429615eb346a55b07892fc128e1

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