Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ffd04ccc8e1a3c…

MALICIOUS

PDF

85.5 KB Created: 2021-10-07 21:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb1138a3be434aef5aa47e6217586581 SHA-1: 65f385a5ca149759fce75e6806c26cba8e73be4d SHA-256: c6ffd04ccc8e1a3c48d4e56bb3867c52af8e0915ff9b84994e0f82caef454fa7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm, suggesting a phishing or redirection attempt. The PDF structure and embedded content indicate it's likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://bodybybodyology.com/ckfinder/userfiles/files/67651442977.pdf In PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1615e0d0166584---fekokopa.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/penakiwi.pdfIn PDF document text
    • http://cycling-software.com/files/file/41044933425.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/wiwijisete.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210924_01AC04048C1C8283.pdfIn PDF document text
    • http://jsdarvin.com/files/xapesibitiguwozorarumabi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614758eb8774d---vatukutuwulurokazo.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/zudome.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/bozalomig.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/radibides.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/82457670026.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/37933032732.pdfIn PDF document text
    • http://npas.ru/pic/file/birediderexupebivogat.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/petadoduk.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/84100164105.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/pesiwaramusejibi.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/tinagosexikozefumaginenot.pdfIn PDF document text
    • http://groupkaishan.com/d/files/tulojemegoned.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/medidegajimuka.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/5b5e5dcddb78c213142299b89547fef8/2547137342.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/34484771047.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/35951490315.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/gifenetaxenidifumudixev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=rlcraft+how+to+kill+dragonPDF link annotation
    • 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_off0000e701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE701 10676 bytes
SHA-256: 409c749059c7d1fa37615eea6f99bba0c1bb68c2d48ca635e9602737269b8404
font_01_sfnt_off0000ff48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001175a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 19224 bytes
SHA-256: bb17c4d3c4d4bdf5db9dba3e6e6639675e0f86013ec1d2da04dd158783d7a948

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