Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b89a96708fb73b…

MALICIOUS

PDF

75.5 KB Created: 2021-09-26 19:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ea28873844ff71e2bf2e72c535b291b SHA-1: d69798427c4c726da8ea5051d2b35697f7739cd3 SHA-256: 57b89a96708fb73b601510a531f22175ed71f76d058cb8b1dc5d4d455abbd21c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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 http://becskeicsodajo.hu/admin/fck_upload/file/76110308310.pdf In PDF document text
    • http://urgentcarepb.com/userfiles/file/wodanok.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/62357985102.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/liwoliwobibix.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/95510163933.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/vujakomokuw.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f35c24f880df410b00ea24c2869af0c9/raduvutizusikotez.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/86853081045.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/wamikega.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/76855759552.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/xigiji.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/33283355064.pdfIn PDF document text
    • http://santinitravel.co/files/others/rorogalol.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f772f07b0b---rofikebofajedasoz.pdfIn PDF document text
    • https://ywint.com/ckfinder/userfiles/files/1631755929.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/41638230787.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/megototijiberuzifu.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gijebe.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/40948893476.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/daravobire.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/jakugixujuvefuxujizuzav.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/91624884841.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/gabimive.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/bajomarotefev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=doraemon+game+20mbPDF link annotation
    • 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_off0000bddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDD 19328 bytes
SHA-256: 21e17ed9e325da2ed1186989177654ca492ccd940b2354086757ecd0d2234f7d
font_01_sfnt_off0000f09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 10428 bytes
SHA-256: 8a463b36ef9461febe064ef6b7001aaa58ba24625def1ebcf9c457517f455311