Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb69489cc1d0d397…

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 16:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c625f59d126b38e80ba501b6b60fbee3 SHA-1: 424afb08d41bced6d7b220389a91ad7acbabd106 SHA-256: fb69489cc1d0d39764a606a81c29b54a5fde39ae05d724948c153248282fb632
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains an embedded JavaScript stream and numerous external URIs, suggesting it is designed to redirect users to malicious websites. The primary purpose appears to be a link farm, likely intended to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://cructi.ru/uplcv?utm_term=gangstar+rio+city+of+saints+free+download PDF link annotation
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/kunagijopivenerunigazakul.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/29103506762.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131595fe62da---84900953847.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/38361783683.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/tapojiredo.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/dufunatenuxutizubizaj.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/gobapalepefugu.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/dulezeg.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/vujevefinugusave.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/79393159312.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/gixofofakarovewepamamufa.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/27195231519.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/vojilod.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/25678485177.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/41604001839.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/18809673445.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/2591351042.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/dixuxinijabuwigudeda.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/jifuluxivagivur.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/xakovasowadetamem.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/86710140185.pdfIn PDF document text
    • http://nprofit.hk/userfiles/zotawisuwu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe4d8834a4---vadivatugimobuxeno.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/58958573344.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/bazumikepejez.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/72775952351.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/sekekidizijojajebij.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_off0000c126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93D 10892 bytes
SHA-256: 1b7efb560703ed86bdcbdb197f16bbd6a3939361fb182059c28fe8d8f3a5c176
font_02_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 19296 bytes
SHA-256: 48703c5cd69d51ded860bfa63d0df5b08eae134b1c2ef69980e50827a2548b70