Malicious PDF — malware analysis report

Static analysis result for SHA-256 b846343ece28604c…

MALICIOUS

PDF

100.2 KB Created: 2021-02-15 12:54:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5dc2678c0639c141d6282730868d83d3 SHA-1: 7cdec31256e78e1b07659c15c4656200651e849a SHA-256: b846343ece28604ca45137a03fd1047883a8b4ed625091c737ba228665fa9f18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'Divine comedy book cover' and 'wkhtmltopdf', likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://seumenha.ru/123?utm_term=divine+comedy+book+cover PDF link annotation
    • http://cyberghost.store/circumference_of_a_semicircle_worksheetqxst8.pdfIn PDF document text
    • http://luminar3-download.xyz/fadow4asb9.pdfIn PDF document text
    • http://closemaze.com/guardian_report_your_protection_plan0duaw.pdfIn PDF document text
    • http://zizaburixakog.iblogger.org/free_html_email_template_code.pdfIn PDF document text
    • http://ponoxavar.iblogger.org/1854131108.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifusejikudit.rf.gd/parents_guide_crouching_tiger_hidden_dragon.pdfIn PDF document text
    • http://lafeseg.rf.gd/zosarulalewuzex.pdfIn PDF document text
    • http://fuzaxovojige.epizy.com/53756556553.pdfIn PDF document text
    • http://jawedujap.rf.gd/crafting_guide_poe_3._6.pdfIn PDF document text
    • http://fikikozazilut.rf.gd/compressed_cellulose_sponge_sheets.pdfIn PDF document text
    • http://fukekixejup.epizy.com/hp_battery_calibration_tool.pdfIn PDF document text
    • http://fezabum.rf.gd/3d_bluebeam.pdfIn PDF document text
    • http://timikawimi.rf.gd/first_marriage_certificate_form.pdfIn PDF document text
    • http://tovujifemiga.rf.gd/michigan_warranty_deed_forms_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14173 2856 bytes
SHA-256: 6a7390c9e634f7f167841a75ffa617ce3f7010ba402b4c06ad0a47e5500b6a59
font_01_sfnt_off00014b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9D 5032 bytes
SHA-256: 014e3013120c4c9906f42eccad6253398b6bb689a191ee01bf8c6efeeaedfc06
font_02_sfnt_off00015cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB6 12032 bytes
SHA-256: 9e5f379ffcae4f6f427ba8bdbd02afd624ba1fb2441bdcccf8dea2d03698bc88

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