Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c9e650f74d3bda…

MALICIOUS

PDF

74.3 KB Created: 2021-02-10 12:30:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: cfdbf70edec522359136f5111305df95 SHA-1: 1fbcb91843a026216b4277d66c75adf5ab38f7cc SHA-256: 16c9e650f74d3bda3a0c77d18971910d70c8e1b3dc69fbc005a6e4b13ab8dcb3
226 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://leonvi.ru/wb?keyword=excel%20xml%20spreadsheet%20file%20extension PDF link annotation
    • https://xidekudogigut.weebly.com/uploads/1/3/4/6/134683706/nibeliwixobotivati.pdfIn PDF document text
    • https://gafepodaxo.weebly.com/uploads/1/3/4/6/134606739/lozinadimej.pdfIn PDF document text
    • https://gedimonisesejed.weebly.com/uploads/1/3/1/1/131163996/gotasovumobur_kekezarag_jovuvuruzibi_xepavegifi.pdfIn PDF document text
    • https://lejujazu.weebly.com/uploads/1/3/5/3/135337057/wuvusemuvef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476952/normal_5fe2df4c15466.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/b5d2f39f9b3e6.pdfIn PDF document text
    • https://padaduzarunum.weebly.com/uploads/1/3/1/1/131164270/8423014.pdfIn PDF document text
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/bomesigu.pdfIn PDF document text
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/4dfae5f44.pdfIn PDF document text
    • https://cdn.sqhk.co/moturira/eOwhgqn/jorumumelosuzojateked.pdfIn PDF document text
    • https://kazenatujexisof.weebly.com/uploads/1/3/1/6/131637291/xusovapumepi-kukuze-guremenubi-karagadikanari.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/jhlgeha/25590725291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401558/normal_602374f6b0dc4.pdfIn PDF document text
    • https://butopejejix.weebly.com/uploads/1/3/2/8/132814220/rerefedub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476294/normal_5fd672d71138a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 5420 bytes
SHA-256: 616e9081effe04d5531794eab8b5a18dd7fae1eada8adcf0d0931779202543a2
font_01_sfnt_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 10756 bytes
SHA-256: 4cf67cdef5c7c9c058004063c9d044152b4696ed2513bb670ec8e679e3b2fa6a

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