Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a55c67e1fb82f2…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 17:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4ddd552b10984acc2b2ef0a73b07898 SHA-1: 6d98158a5bfabda153615b5c00aa6b035028c4e3 SHA-256: 69a55c67e1fb82f266377218bc06baba1ca5eb7b7fd3ebad4ec5f0f73e06b680
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute malicious content. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://fxlcd.com/upload/file/39402347621.pdf In PDF document text
    • https://italvaping.com/file/8867130002.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/gobupegijiwezedew.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/45524643023.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/36789002121.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/69509334703.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/rolol.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/rs52qm4v8m05i2vspcd4pjr3u1/muzedonakugini.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/sujararixesanok.pdfIn PDF document text
    • http://aven.su/userfiles/file/4993412758.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/naluzilajisise.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/joxovugabiradagubamanaxer.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/fezikalenotalaxalu.pdfIn PDF document text
    • http://gardatrans.com/content/Files/xibofibeputumisosir.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109152123391958.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613950f9cb07b---xositakef.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/varenofarugudi.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/luxeporitefibujalub.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210903_011504.pdfIn PDF document text
    • http://potlista.com/file/files/risokax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cara+redeem+kode+genshin+impactPDF 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_off0000dac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC5 11040 bytes
SHA-256: 8ad609974f243e3184cf498d0183a9585aa2500654e2f1bcc64e0fd90bda2d90
font_01_sfnt_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 17572 bytes
SHA-256: 45808424d26c538476521b9b90a80774d819537780a540715077a12887faef59
font_02_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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