Malicious PDF — malware analysis report

Static analysis result for SHA-256 139eb75e1cd05ee2…

MALICIOUS

PDF

85.9 KB Created: 2021-09-14 18:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f72b2020edfaff6e5756a6e54f574c4 SHA-1: 65cb3ca5fbda00827b06bf3e2fa241b2808b557d SHA-256: 139eb75e1cd05ee2e02ab247a9c16f345c4f411b99b2e6c4e6dd8894a1c2a407
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on disposable domains. While no scripts were explicitly extracted, the nature of PDF-based malicious content often involves embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://riminabda.sk/userfiles/file/4509925942.pdf In PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091020525184.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/1820471292.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/45978450866.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/86585083773.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/25278945581.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49460857389.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/mawabevi.pdfIn PDF document text
    • http://aurora-c.jp/files/files/borusoxebi.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/15593895163.pdfIn PDF document text
    • https://goodline.by/userfiles/file/tagew.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/sibeluzokepo.pdfIn PDF document text
    • http://onelove.cz/file/xoxukidagotalapirodetumi.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/pulomusu.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/fewemobozikajafove.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134ededbd0cc---meluvutamobesoz.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/pupemafovizafisubisulu.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/jijefevojavugisuzazuxapa.pdfIn PDF document text
    • http://canvangdientu.com/images/file/54416114693.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135701441b4a---42483416815.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/23148275735.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/lesemepenu.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/13775528017.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/41723030777.pdfIn PDF document text
    • https://atiksigorta.com/files/28685933688.pdfIn PDF document text
    • https://tomas-music.com/contents/files/10656942938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pes+2016+android+apk+dataPDF 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_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 20716 bytes
SHA-256: b7c6cdfa01c5323b329afc307a11c65fc9d36f020684ff9e1cd3b6a2b719c54e
font_01_sfnt_off000117f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001300e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300E 10896 bytes
SHA-256: 75fa51dd13f2a594dc59489c0b38ea6f03a333433b0b0e1d6a7cd476be7cc87a