Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b6db4ef5f3dfdf…

MALICIOUS

PDF

76.1 KB Created: 2021-04-03 21:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75c984a8d25fb97d680bf842cca49886 SHA-1: d3c949116ee956304e8adb0036467f4333e777ac SHA-256: 10b6db4ef5f3dfdf2987f5c4664d4303a03877e21284d5430d88c4588ddc4d90
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. One such URL is https://mezovuduw.ru/wix?keyword=idle+miner+hacked+online. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=idle+miner+hacked+online
    • https://lewisenoj.weebly.com/uploads/1/3/0/9/130969481/raxemepotopido-rinupaler-vanojalet.pdf
    • https://cdn-cms.f-static.net/uploads/4455399/normal_5fe8d699c2e16.pdf
    • https://bemafaparad.weebly.com/uploads/1/3/2/6/132681832/31a7a.pdf
    • http://mexicotop3.xyz/432989142695piyb.pdf
    • https://sosijujanakuf.weebly.com/uploads/1/3/5/3/135387992/gepobekeboler-zogige.pdf
    • http://dommasters.site/tidumoxudewilazajivorpx5q.pdf
    • http://mibijuzorifif.getenjoyment.net/actuadores_neumaticos_festo.pdf
    • https://razosuxox.weebly.com/uploads/1/3/4/7/134719946/5e1f6601d.pdf
    • http://kexolifowuj.medianewsonline.com/rifokurebumo.pdf
    • https://wafukereloxajof.weebly.com/uploads/1/3/5/3/135311523/vinanoxugi-tiwod-nomusokagi-podupawome.pdf
    • https://static.s123-cdn-static.com/uploads/4446283/normal_5ff3bf4046b23.pdf
    • http://leninuludobodu.mygamesonline.org/vabakenowub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vorasokipat.rf.gd/descargar_implosion_full_apk_2018_mega.pdf
    • http://fabomisibis.rf.gd/52694073144.pdf
    • http://nakarajibap.myartsonline.com/77930117903.pdf
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_5fa1476e5e924f0f9c96702f67ff0403.pdf?index=true
    • http://jurorinidup.rf.gd/engineering_signals_and_systems_in_continuous_and_discrete_time.pdf
    • http://sugizujesel.epizy.com/fofopiz.pdf
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_950aa280e3cf494491cdb62a7732a767.pdf?index=true
    • http://rexefobixavater.myartsonline.com/zivim.pdf
    • https://7043ee2c-bc2d-4d46-b82c-b0075177c1aa.filesusr.com/ugd/f862b5_aa5fbf33c66b4400af0474c75dedcda9.pdf?index=true
    • http://wogafut.rf.gd/bidirectional_search_in_artificial_intelligence.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea91.bin
dc746fe2f484afef45d18ac2d2ff68811c7b2df6f45e972ee7eaba11eadb0020		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 5004 bytes
font_01_sfnt_off0000fb5f.bin
c2ba9b998f37bde423977ad0239bdb4e3b857b10b6f7be51a3acde0098391290		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 11800 bytes

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