Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfce5383845c7ba…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 21:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 38663a4e07069b8085c12283e08af988 SHA-1: 1019a887c4feda7ad4e6083562739555aad1f173 SHA-256: 8bfce5383845c7ba94aa6e14612efe7f10364d46a79f49833cfdb1660afd0fc9
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://aviteksural.ru/admin/ckfinder/userfiles/files/jumubaxesadinid.pdf In PDF document text
    • https://ww150001.linebot.net/upfile/files/20210909131857.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/89659858869.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21090410385034565704fhpo.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/34422279098.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///59621733120.pdfIn PDF document text
    • http://immopolignano.lu/images/80469955721.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/55695084575.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/74616309110.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/rololek.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/78877704835.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/93437512489.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/tagadupaworazo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50bebf787---63731922689.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/87570911382.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/xutig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136921b4f927---fareleki.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/12695934561.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/51865191860.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/15265373070.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/wozob.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/84726041221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+gta+v+mobilePDF 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_off0000e00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 10612 bytes
SHA-256: dd37aad221a1ce53209c3bd6974a6f6c09ad9e93f0aec81849b0ce68132d3fe5
font_02_sfnt_off0001102d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 17248 bytes
SHA-256: a899e5aa9213b5999aa9e0813ac569f35a93ccc087577dc73d7b7b9d5fe71ad3

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