Malicious PDF — malware analysis report

Static analysis result for SHA-256 7334ebae99b98c09…

MALICIOUS

PDF

75.7 KB Created: 2021-06-11 11:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 48d3695feb5150bb127ea553510d14a7 SHA-1: 0a17206d5a7656af43ddd7e14cd5efdf63807d19 SHA-256: 7334ebae99b98c0999d8047916b1253cf7bed00a7b62973d068df7e2acee1a83
186 Risk Score

Malware Insights

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

This PDF file is classified as malicious, exhibiting characteristics of a link farm designed to redirect users to external sites. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, with one prominent URL being https://ketchas.ru/pbw?utm_term=mortal+kombat+x+sub+zero+fatality. The presence of multiple PDF links on disposable hosting further supports the malicious intent, likely for SEO spam or phishing campaigns.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ketchas.ru/pbw?utm_term=mortal+kombat+x+sub+zero+fatality PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427799/normal_5ff2980733c72.pdfIn PDF document text
    • https://vugadeji.weebly.com/uploads/1/3/1/4/131406436/giroxupuvarupa_puxotize_buzizivudapos.pdfIn PDF document text
    • https://jomopejizudo.weebly.com/uploads/1/3/4/6/134664487/zutujitonotabufel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379733/normal_60b8f6d01c721.pdfIn PDF document text
    • https://fulafokowezoje.weebly.com/uploads/1/3/4/3/134384829/mawawumenolimu.pdfIn PDF document text
    • https://jixulonirepib.weebly.com/uploads/1/3/1/3/131398443/c4a6fcfc4651b7.pdfIn PDF document text
    • https://zalatedaduliwa.weebly.com/uploads/1/3/4/8/134881590/fuxemedubapesi.pdfIn PDF document text
    • https://fijegude.weebly.com/uploads/1/3/4/8/134850985/gidurolirisepoke.pdfIn PDF document text
    • https://mabatuba.weebly.com/uploads/1/3/5/3/135303696/ad562d8b70e1.pdfIn PDF document text
    • https://kazagito.weebly.com/uploads/1/3/4/6/134665665/a94900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_604ed11fe587d.pdfIn PDF document text
    • https://xoresobo.weebly.com/uploads/1/3/1/4/131407398/jilufun-duboka.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/dolipupenigi-sakajopovuzu-linajalevuloj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gikopedawa.pbworks.com/w/file/fetch/145094532/download_free_lightroom_presets_dng.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/w/file/fetch/145092708/mezeberulepa.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_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 5340 bytes
SHA-256: cb8bc036d3aefc1bb63e49dfe584ec0838aceba7e776bfa01b37a9b123f721e2
font_01_sfnt_off0000f9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 11608 bytes
SHA-256: 53a8a928063daac4041b227e1a3ff9e488e67ae19d236a15a9f42bd4ccc5d5b9

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