Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4cc0a2ea6850ff…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 14:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d66860317e1a7cc08da575065859261d SHA-1: e56ef5527fe0d7bd8f5c626611cf76cea4858764 SHA-256: 5c4cc0a2ea6850ffbdb9e7fa8690e6f218ffaf71a9e731f62540f9a4143a3d79
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also features numerous external URIs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or link-farming campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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 https://laborke.ru/uplcv?utm_term=correct+golf+ball+position PDF link annotation
    • http://autodilykanka.cz/cmsimple/images/file/gafeluv.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/30334147201.pdfIn PDF document text
    • http://calisnt.com/uploads/files/86030265706.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/vogefezimevogipewigidufer.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/bikarugunawixiv.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/vipagajodegazorumojut.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/46989870271.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/wotilekozalu.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/24658554002.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/73071362692.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/zivuvidorebogubekaf.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/69475977871.pdfIn PDF document text
    • http://machulski.com/public/file/zozekipexupirabukupuzu.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/sewusilezexeg.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/45579808003.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d51cd8bf22---65482034222.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/baduxarikogufep.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/siripi.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/juteturunumafis.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/povobibufej.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/39529336326.pdfIn PDF document text
    • http://seritour.com/rsm/files/gedibizesof.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_off0000d1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E0 10824 bytes
SHA-256: 71bbc2fbccb697d7ea14ce54b4408a5f6d13f2959e4ccc5972046ab358ae6de2
font_01_sfnt_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 16936 bytes
SHA-256: 859d41deb8cd293efea6ff115fe1fcb842e8fe56bf57f0146a5fa1cf8b3e74ff
font_02_sfnt_off00011699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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