Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2cdf5378b95199…

MALICIOUS

PDF

72.8 KB Created: 2021-09-23 13:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60d8d477b895d4cf758db528faa925ed SHA-1: 2008a1037bd989911847badb3b48cbc4fa4f6a9f SHA-256: 2c2cdf5378b9519960a77af460ea45899d29855fd4b5f0764dbec6ca1eaec571
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=boxing+star+mod+apk+unlimited+money PDF link annotation
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161419de5261ee---sakatowovupuzo.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/baleveseta.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/49146276203.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/6215537030.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/66451159352.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/seragigilefifobufe.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/39120674055.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/25926826033.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/65483000188.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210919110205779662h3zcz.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/60766776431.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/jonererixakuxalakotu.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210909120259.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/4271745409.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/15770619511.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109152033343732.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/41168639487.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/duvekaxonawonelefezi.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/71834621555.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/23164354962.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/69106901642.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/xuvufesuzeji.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/barojabatosimo.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/70133280486.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/51159844046.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/1654486752.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/47755251900.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD383 16256 bytes
SHA-256: ca0689e982a0e2352ed237e6426d4f6c464739f621cefcab7d2be37a69919c3a
font_02_sfnt_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 11196 bytes
SHA-256: fa193871de1d834f49f66e5d789751247ebcfafacec6f1670375cfd4ad92b70b