Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8564ec64d4b126…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 13:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e349d3b25f836ada3be7de099d24a29 SHA-1: f2d161a198446db921ad96d98f7837eac2bf7061 SHA-256: 8f8564ec64d4b126111985ec56ce03917a905d656edccda512c77615e6ebd182
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also exhibits characteristics of a link farm, with a high number of distinct external URIs pointing to potentially disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://kingwrapcarspa.com/upload/files/41145427459.pdf
    • http://stylowa-pss.pl/userfiles/file/laxiwuzuzikex.pdf
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/16055519441.pdf
    • http://emannsltd.com/userfiles/53943726799.pdf
    • http://rajhansnursery.com/userfiles/file/rubowakavunub.pdf
    • http://varadimasszazs.hu/uploads/files/83515609674.pdf
    • http://idealhca.com/admin/images/file/27413620476.pdf
    • https://valgott.com/images/userfiles/file/76152933479.pdf
    • https://viettincapital.vn/upload/files/90573586090.pdf
    • https://trieurodata.ro/images/file/4648381777.pdf
    • http://villaelen.it/userfiles/files/71407478144.pdf
    • https://n-zvuk.ru/upload/file/53028215008.pdf
    • http://stisk.com/file/1341385415.pdf
    • https://asoriofrio.org/ckfinder/userfiles/files/bolugixudedak.pdf
    • https://vidaleve.ind.br/ckfinder/userfiles/files/nerol.pdf
    • https://migger.dk/userimages/file/48059859496.pdf
    • https://superlitefan.com/uploads/files/jabiripabovopin.pdf
    • https://soportedevida.mx/ckfinder/userfiles/files/40161373539.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f575de247e---33680028358.pdf
    • http://ecohouse-lab.de/userfiles/file/24260741639.pdf
    • https://playerpress.com/ckfinder/userfiles/files/99641644872.pdf
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/xovadelujozuvexuxafipe.pdf
    • http://maschimaurizio.it/userfiles/files/73770508714.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+phone+manager+app
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000debf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 16792 bytes
font_01_sfnt_off0000f6d6.bin
ab2f2fb2af83fe55eccbfd9b890dbc3b20f5ce705415eb454a2960b4937f1ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 10644 bytes
font_02_sfnt_off00010f0d.bin
799f35cdf48c48ba5393f0c45219ccc6c2f472728e1b6035820000da163612fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0D 18256 bytes

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