Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5168b62633c34f…

MALICIOUS

PDF

80.7 KB Created: 2021-04-01 10:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 891145cb754804fff23da74b6a21734e SHA-1: a3447f51f6e9b423a7d2b85fb62a7ca66525f615 SHA-256: 4e5168b62633c34f9a218f7e51e604639f114e95f9457bccfe254f23d986b8d8
156 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 point to Weebly-hosted PDFs, suggesting a link farm designed for SEO manipulation or to host malicious content. The primary URL, 'https://jacksth.ru/wix?keyword=dragon+city+cheats+and+hacks', is presented as a lure for game cheats, but the overall structure and ClamAV detection indicate a phishing or trojan distribution attempt. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/wix?keyword=dragon+city+cheats+and+hacks
    • https://libuxokoxirafax.weebly.com/uploads/1/3/2/6/132695332/gamolikelokusojule.pdf
    • https://jerepubiz.weebly.com/uploads/1/3/1/6/131606505/vavota.pdf
    • https://resagivet.weebly.com/uploads/1/3/1/3/131383325/7207939.pdf
    • http://labebatazavanoz.mygamesonline.org/calligraphy_letters_design.pdf
    • http://vurejowug.mypressonline.com/fodifuvemokazasewibalavo.pdf
    • http://topagut.iblogger.org/17690574752.pdf
    • https://kodabovoxalomas.weebly.com/uploads/1/3/5/3/135340354/f554ac8ac16.pdf
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/9346146.pdf
    • http://jewofuvivonog.getenjoyment.net/28778920817.pdf
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.pdf
    • https://vuxamirajuka.weebly.com/uploads/1/3/6/0/136082549/80919388260.pdf
    • https://cdn.sqhk.co/nisugewameru/hajcjdv/gixefagimiko.pdf
    • https://cdn.sqhk.co/kuvapipitol/BsXhcMt/80598153520.pdf
    • http://wufamega.scienceontheweb.net/casio_fx-115es_plus_decimal.pdf
    • https://vodazifuja.weebly.com/uploads/1/3/4/2/134265633/15b9c8ccd173ed7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_6a28fedacfb24d1c886f99ae6606b13e.pdf?index=true
    • http://lunofalogejutu.epizy.com/lotebuf.pdf
    • http://kutezowifemiwe.epizy.com/angular_material_form_field_width.pdf
    • http://suzimobuxorojig.epizy.com/reduction_of_formic_acid_to_methanol.pdf
    • http://worutigije.epizy.com/27970846371.pdf
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_1d70ee52b449432a95fc60a320427359.pdf?index=true
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_644e72eff12043c1bd8a21327fb13091.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed4.bin
4e019c39dd287119a8afd890c20ccd39a5b1af43afdc936ca271cfbb873b8303
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 5332 bytes
font_01_sfnt_off000100f8.bin
087fdce5d84c2b755c414fdc14736e11f1842504987d7fef795f423319dfae43
pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 3448 bytes
font_02_sfnt_off00010e85.bin
15ba52272c8a825a50f51d1458d96b01426f89c5c4d4f2e37ad7a58b1e6696c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E85 11400 bytes