Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4837ddd78f07232…

MALICIOUS

PDF

72.1 KB Created: 2021-02-06 12:08:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a012dcfda701ffa717d15f68ffaaca54 SHA-1: 32d3bee6799ed8e0fcea7b9ddae34186ae642b31 SHA-256: d4837ddd78f07232e76cfbe2c5d17f2cd5c37b7b23e4961f1adcb44117e55039
126 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF_URI heuristic indicates an external URI pointing to 'baarspo.ru', which is likely the primary malicious destination. No scripts were extracted, but the PDF structure and heuristics strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=relampago+del+catatumbo+video PDF link annotation
    • http://innov-cis.net/boundary_layer_separationfld5r.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/ijiKghg/stickman_sponge_rope_hero_gangstar_crime_sim_apk.pdfIn PDF document text
    • https://nisaxiguxizi.weebly.com/uploads/1/3/5/3/135306566/145406.pdfIn PDF document text
    • http://vejinow.22web.org/1375686339.pdfIn PDF document text
    • https://cdn.sqhk.co/gisusisabez/v7Pigg5/16907843633.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/d4AjcoK/iclub_manager_apk.pdfIn PDF document text
    • http://paruvam.22web.org/chiari_malformation_cause_headaches.pdfIn PDF document text
    • https://powirubojeti.weebly.com/uploads/1/3/1/4/131482959/kiterul.pdfIn PDF document text
    • https://cdn.sqhk.co/jifedibodo/hjwhefo/braveland_heroes_map.pdfIn PDF document text
    • http://sepibigejakina.22web.org/68458008397.pdfIn PDF document text
    • http://zavifuvalo.22web.org/series_and_parallel_circuits_problems_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bisiku/calvinist_and_reformed_theology.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/music_for_children_s_ballet_class_free.pdfIn PDF document text
    • http://gojaxuga.epizy.com/sample_sales_kit_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/transfer_to_excel_spreadsheet.pdfIn PDF document text
    • http://jupexalamax.epizy.com/how_to_use_slicer_in_google_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/opposed_piston_engine.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_off0000d99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 5324 bytes
SHA-256: acb6a10d8c4ffb2704102cec84793eea5b841faee6742c0c712814d2f8a7cf99
font_01_sfnt_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 11696 bytes
SHA-256: 97fb9bac33d78bf3f523ebab0c38dff91995a041763b8807d7a61dcf7fc7b094

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