Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d99a47532f75b89…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 00:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2edcff6642b4273d4bc6f047588c936d SHA-1: 7dd8b90fb167194a9233df65c9eda3d2b4d78be6 SHA-256: 2d99a47532f75b89378f1669bd3548e078d295ef183c4c2c0f115e9aa78492cb
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file detected as malicious by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and numerous external URIs, including one pointing to 'nomylo.ru' with a query parameter suggesting a lure for 'ios launcher apk'. The PDF's structure and embedded content indicate it's designed to redirect users to potentially malicious websites, likely as part of a phishing or malware distribution scheme. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5544

Heuristics 5

  • 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
  • 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://nomylo.ru/uplcv?utm_term=ios+launcher+apk+full+version PDF link annotation
    • https://fuze-pay.com/ckfinder/userfiles/files/buvolimiwatofofowa.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/41816414431.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/watibevetasazero.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a1eba8a8f---nijemavapizatetonide.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/jabexap.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/12658909506.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/62728744741.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/40884535976.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///81841747571.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/34004421150.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b8a14bcdb---danifunimubaguvigarere.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/45831764295.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/34736305089.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/45829890671.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/93308470556.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/velovipenotalaz.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/fibodafi.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/xupirovitiveruwefes.pdfIn PDF document text
    • http://cudicio.it/images/file/9724394282.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/29494922607.pdfIn PDF document text
    • http://puisan.ru/uploads/file/bibivuxefapiluwijosul.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 10688 bytes
SHA-256: 41ea738d565651a19283cadb44cd5833c8df3940ffa16af586c903302975924b
font_01_sfnt_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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