Malicious PDF — malware analysis report

Static analysis result for SHA-256 4025b055c1ecc80b…

MALICIOUS

PDF

69.3 KB Created: 2021-09-16 21:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea79423786ed8e95bb4556dd89003d0e SHA-1: 7b7df5e974652b9c3cb2b780a217171c0c47c102 SHA-256: 4025b055c1ecc80b316390e808c893e4a5b8bd138563ea836feeebc064f4bb48
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings and numerous external URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving redirection to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wastran.ru/uplcv?utm_term=spanish+words+that+start+with+rr PDF link annotation
    • http://veterinariacomportamentale.it/userfiles/files/lativojekexe.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/novuzudabaxitifugozejujo.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/82381251655.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/73489100605.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/62576842432.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/kodelesotewariz.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/58250801684.pdfIn PDF document text
    • http://slovoveri.org/userfiles/babowebasebamiselupibolo.pdfIn PDF document text
    • http://attlas.center/userfiles/file/21158901561.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/lisomamatama.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/grrinb2psl7b1mae6rl2kdnbj0/kotizevovedumepesus.pdfIn PDF document text
    • http://sungder.com/upload/wekimemasetemepejeduj.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210907021010.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/80416132123.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/nuxewedovozubizawowode.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/40730311531.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/pesoramisinolitasisaditez.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/69511624064.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/zemolani.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16139a178709b1---11588833954.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/tixegef.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/54881240587.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_off0000b122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB122 10472 bytes
SHA-256: ad1462dadc8003425e549a0f556cc7e584e932ad0197b1ebb40dfced4278c030
font_01_sfnt_off0000c8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 15240 bytes
SHA-256: 8ae6d627a39c358e9c0f7396f5544b7f828f706ba4676d8b15a3f35f95be69af

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