Malicious PDF — malware analysis report

Static analysis result for SHA-256 24529034c5a93aab…

MALICIOUS

PDF

76.9 KB Created: 2021-03-27 10:21:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f134a550162fed6cd3c5b187d5862e3d SHA-1: 5731faeece116cc132e7cb62166a82d4d7bfec14 SHA-256: 24529034c5a93aab7ce10804ff9db3347df2449ebc751dfdb5a59a6007af090d
134 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains references to 'autotune evo mac free' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure for free software. The presence of numerous external URIs, including one pointing to a PDF file on 'titoto.xyz', indicates a likely download mechanism for a second-stage payload. The ML_NYX_PDF_MALICIOUS heuristic and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/123?utm_term=autotune+evo+mac+free PDF link annotation
    • http://titoto.xyz/261077169015gbds.pdfIn PDF document text
    • http://nizeguz.iblogger.org/platform_toolset_v110_install.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_5fe639d22af32.pdfIn PDF document text
    • http://profapp.pro/737958425246k26z.pdfIn PDF document text
    • http://pubguckazan.com/49921281578wup12.pdfIn PDF document text
    • http://xenuven.22web.org/bullet_journal_weekly_spread.pdfIn PDF document text
    • http://fokuwezowixo.iblogger.org/python_tutorial_in_hindi_for_beginners_full_course.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369494/normal_6006bda13b998.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377400/normal_5fcd5ed9a96da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380383/normal_5fd38bff6d3dc.pdfIn PDF document text
    • http://top-odejda.com/piretopiruburodojujeravk05dq.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/88251107379r9d9y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474992/normal_60242e440b2ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9147e56e-220d-4976-aaeb-2bb3843d006c/gavotokazorokafuwaxutija.pdfIn PDF document text
    • http://milisepidug.rf.gd/79341670701.pdfIn PDF document text
    • http://revasaxoz.epizy.com/laminigutaze.pdfIn PDF document text
    • http://kolupus.epizy.com/poweredge_r730_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a6b02c-aef9-46f5-80f4-411ca9982783/tezojepu.pdfIn PDF document text
    • http://tasefabomodewiv.epizy.com/denote_vs_connote_worksheet.pdfIn PDF document text
    • http://xajokaxakubif.rf.gd/13219985335.pdfIn PDF document text
    • http://solobasoridevel.epizy.com/zesor.pdfIn PDF document text
    • http://nedanitajaw.epizy.com/zijaderumedetixivosowam.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 4868 bytes
SHA-256: dc978d86c26d29812aa10625dcb4450d2954c30ca3eced5848c7d704c2b3b0e7
font_01_sfnt_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 10812 bytes
SHA-256: 3ecd66041d5f927ee66df301a0dc6180ae2c1a27183519c840fd0fcd0a9fd097

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