Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b3449e5fca1646…

MALICIOUS

PDF

68.1 KB Created: 2021-10-01 21:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d4162e0786e29abfc10b3322f411f7c7 SHA-1: 1649a326bd8dfee98d9906af6104114e26ec2b41 SHA-256: a1b3449e5fca1646f28c1cc9dd0dde376cfb4402d3557f71f54c5a1fe851acac
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the sample is part of a link farm, and the embedded JavaScript likely facilitates redirection to these external links. ClamAV and ML classifiers confirm the malicious nature, with ClamAV identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://entryexpress.online/chapter_images/files/84562086634.pdf In PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/jekoro.pdfIn PDF document text
    • http://halmar.info/userfiles/file/16163716682.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/96577061620.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/96897553947.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161422d1f5f6b2---pizewawafisul.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090101015873499.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31816418640.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/62671461511.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/3876902113.pdfIn PDF document text
    • http://htwy.com/upload/file/12990896692.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/gikovoxufifedama.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-22/20210922191102147797.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/relituwagexibekoxarokunop.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/bevonizam.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/55699937043.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/cf645b0d60a9952e37b2a723b86240ec/tagal.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/85298616002.pdfIn PDF document text
    • http://www.moyekolodin.com/files/zuzezexidez.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/vasuti.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/jineguniteranekotafukeded.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/99604702746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=apk+youtube+music+premiumPDF 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_off0000ad06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD06 10652 bytes
SHA-256: ea6b53c7e9756bfaeb8ce68f0bcb03b75fdfb6acc085ab1be2c235d1322f63fe
font_01_sfnt_off0000c552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD64 14948 bytes
SHA-256: 817a36ad48e135e278009b5241397a61e9032b0a71f87cc5879e89aef3903fc4

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