Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ae90ee2802be6c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 03:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b7b55d6a1b1f7119965cbd3839e2a8b3 SHA-1: 8e7b1cd15d8db7b7df6350b4d27ca4b3a4d78159 SHA-256: 78ae90ee2802be6c5ebf7c53bdd7764b5d82d9aa9d39c82c8e4b7659e126cb39
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical ClamAV heuristic identified this PDF as a phishing trojan. The presence of embedded JavaScript and numerous external URLs, many hosted on disposable domains, strongly suggests a malicious intent to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a link farm designed for SEO manipulation or traffic redirection, likely to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

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://pistant.ru/uplcv?utm_term=watch+fast+7+free PDF link annotation
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/varanikoxemizidopabemiti.pdfIn PDF document text
    • http://okun.su/upload/file/turunib.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/kegazazaboluzonivo.pdfIn PDF document text
    • http://spakimthi.com/upload/files/96325390292.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/zowapalu.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/ketisa.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/99642440047.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/tawijoxurilazunamoma.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/70070519048.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nvbecrb1i11mjdrqmjg24luio6/70317689871.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/nuruperaja.pdfIn PDF document text
    • http://usagimatur.com/files/others/gavomepusiv.pdfIn PDF document text
    • http://ippon.lv/uploads/File/madefapuseguxagakakura.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/54646104465.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/banit.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/sirozut.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/vurajevowaverowunafalob.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/zodixusufimudixit.pdfIn PDF document text
    • http://eternaseguros.net/files/files/sipisuki.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/26787642646.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/014bdb6e237930d64b79c5ac54cbfe9a/53979196530.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/nutobovupumit.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/69079744483.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/70115057690.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_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 18716 bytes
SHA-256: 5b2c23e00a1c9340bcefe6591ed05e5f3f372072bc5740a13859ca4cf4a7a053