Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dba39c853a6d619…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 02:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f23375cf4696577864476c28384a2d52 SHA-1: 7cd5b7e814716afb315f8a55a6181e31bd4b8bc4 SHA-256: 1dba39c853a6d61996501f0681e2fd93241105b904d487cd12027b17ecb998b5
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious sites. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded JavaScript suggests it may be used to execute further malicious actions or obfuscate the redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

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.
  • 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 http://lnshiyue.com/userfiles/file/20210921173206_1411511581.pdf In PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/521823090.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/zufawinidepin.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/jakemoforoneres.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/65545787401.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/fifatejinatagovojixejazem.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/88449615995.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/desonupedinonumiregeriza.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc0a4ef410---73358955978.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/266829156613a95e477b0a.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/tarobazulukujutabifavefuj.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/25789584966.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/32508058093.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/61062319297.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/29257216960.pdfIn PDF document text
    • http://digifast.cz/userfiles/8751972778.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/samaputupu.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/90839633606.pdfIn PDF document text
    • https://biocoils.com/img/file/lojasu.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/falepuruti.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/najufiwazidesusuxegi.pdfIn PDF document text
    • https://baglab.pl/galeria/file/demagigigidikofi.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/puxemowujukurudomem.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/1462271116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+record+conversation+on+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 10460 bytes
SHA-256: e5cc54380cbc49e2668529c33f2d51075dda0a01c80b88724f9e680817980b45

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