Malicious PDF — malware analysis report

Static analysis result for SHA-256 5725c443a44c206b…

MALICIOUS

PDF

146.8 KB Created: 2021-03-16 13:06:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 59330e00370358a7924d0aff5e69878e SHA-1: 2c0768e6b9ca7c8ea4b6c9e343b9358e3e67c5d0 SHA-256: 5725c443a44c206b6e5b914e14c6e6e59f365054b9c342caf2b51cc19bb64e1d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF structure itself is also noted as having duplicate object bodies, which can be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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://vilenefex.ru/123?utm_term=better+informed+in+a+sentence PDF link annotation
    • https://pulapiselipatux.weebly.com/uploads/1/3/1/3/131378970/zekubetezur-jepajese-mogojokowira.pdfIn PDF document text
    • http://investmag.org/86420370950n59im.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498834/normal_5fc6fe4891d4c.pdfIn PDF document text
    • https://rusudunan.weebly.com/uploads/1/3/2/6/132681855/waxukumumese.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459170/normal_5fed48e624def.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_603ea88349010.pdfIn PDF document text
    • https://betozuwozoz.weebly.com/uploads/1/3/4/1/134108580/rugarelurel.pdfIn PDF document text
    • http://50offit.pro/does_the_magicians_show_follow_the_booksk7ox2.pdfIn PDF document text
    • http://on-arenas.com/garmin_920xt_screen_sizecx2ua.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464730/normal_5feed7da03d7b.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/xizenapupapuwafo.pdfIn PDF document text
    • https://roxunasof.weebly.com/uploads/1/3/4/3/134312726/3889714d7.pdfIn PDF document text
    • https://zedazepofa.weebly.com/uploads/1/3/0/9/130969939/8652445.pdfIn PDF document text
    • https://dapobirot.weebly.com/uploads/1/3/4/8/134888013/4040863.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_6469dc197bcf49b79d124859c77e7434.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_4b6d34b9e7384de4b643f1a2b87d33d5.pdf?index=trueIn PDF document text
    • http://dowirimidezifa.rf.gd/27851470616.pdfIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_7f19a5d33f174cf59a6874b64c587dd0.pdf?index=trueIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_ffc9b8ef49754c8e9d06bc0068459861.pdf?index=trueIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_dc2eb5347f064862849b0b40e2704b79.pdf?index=trueIn PDF document text
    • http://purubonosarule.rf.gd/non_conformity_report_procedure.pdfIn PDF document text
    • http://dafafigu.rf.gd/fixajamasulipabokif.pdfIn PDF document text
    • http://nawabagaxux.epizy.com/84776726836.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_off0002047a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2047A 5184 bytes
SHA-256: 1342187c6366700c289fe72dbc390dcacbf5973a9436f6f665e372a5b5f9b15f
font_01_sfnt_off00021606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21606 11928 bytes
SHA-256: 7922bbf24e8e3a794b78392ccf36cd66a81d5c338b71ac398af176b3338bee22

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