Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b4c067525fa274…

MALICIOUS

PDF

76.8 KB Created: 2021-09-26 17:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fb57fa49f19d986e045cbe7adee43997 SHA-1: b66c3fe1083b4ffdd3db48ebc072300a985070b3 SHA-256: 20b4c067525fa274d6ef116da42390869095824f6d88b9a8d154df52b3e88bc0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to disposable domains and structured as a link farm, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://yoshitomo-kokubunji.com/jcfiles/file/87949597406.pdf In PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/76854218869.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/furojozewemuripo.pdfIn PDF document text
    • http://mobil-tech.com/files/26984273513.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/78770507328.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/54406036621.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/58537357582.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/sawapafavog.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330080b6f7f---pojebowovegerilepu.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/45277280794.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/valamasojuzupi.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/rutemiteparuron.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/tevakarokujer.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/66224431883.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/ganasepede.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210919_5C71B36533E8CB58.pdfIn PDF document text
    • https://satesayap.com/contents/files/femuz.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fefofok.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/ratipijuxopo.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/tedaborujuki.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/36800379937.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/23634323245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+apk+get+followersPDF 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_off0000c354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC354 19008 bytes
SHA-256: 88b1387fd42c12b195267ec1b4bb737b226952f16e59283777b7aed985dc0952
font_01_sfnt_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 10760 bytes
SHA-256: 5518ccb75e59b2cf621c29c1e4c3ac8fd53d94027d75c524cf9f6998211ac1ab
font_02_sfnt_off00010dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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