Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d39c47b87b62c46…

MALICIOUS

PDF

78.6 KB Created: 2021-02-16 06:07:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 7918d869431adebe2bb6a2718fc0ecc9 SHA-1: c3ee2fc6d707032091579f4e170d4a41b04bb26c SHA-256: 6d39c47b87b62c46bd09869ce730d854df865f5f174042cb85dc8ddd41b2718f
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The document body, though heavily obfuscated, suggests a lure related to water heater maintenance, likely to trick users into visiting the linked sites. No scripts were extracted, but the presence of multiple external URIs points to a phishing or redirection attack.

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://druttle.ru/strik?utm_term=how+to+maintain+rinnai+tankless+water+heater PDF link annotation
    • https://cdn.sqhk.co/muvifisi/qLgc5id/calendar_2020_printable_free_july.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446283/normal_5fd9158ca531c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462708/normal_5fe37e3e99a3d.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/ariens_snowblower2yfdt.pdfIn PDF document text
    • http://sibuvre.com/gilovuzogij06kc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384296/normal_6011afd17c8c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469634/normal_5feb788da00b8.pdfIn PDF document text
    • http://gulakami.22web.org/langston_hughes_high_school_death.pdfIn PDF document text
    • http://biomanua.website/lala_ramswaroop_calendar_2019_march00wu3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413125/normal_5fd0d9afb390d.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/aia_australia_full_form.pdfIn PDF document text
    • https://cdn.sqhk.co/wazofelagi/bchjTi7/dark_riddle_apk_day.pdfIn PDF document text
    • http://nubebukexowi.66ghz.com/fegureg.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/rodiligarexo/couple_wallpaper_hd.pdfIn PDF document text
    • http://rudutotisexanib.rf.gd/4x6_shipping_label_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/free_printable_classical_piano_sheet_music.pdfIn PDF document text
    • http://vigiwadovu.epizy.com/83943201678.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/sample_hr_specialist_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/c_automapper_formember.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_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 5044 bytes
SHA-256: 3fabd3cde24c0cabea995b268ede22d91d2da216cfad99c7550c70e63b9abe0d
font_01_sfnt_off0001091f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091F 10380 bytes
SHA-256: e2ad42bb9e0122b04d8a422b7d74a98cd1ccc1148829eedbd1d989088b411717

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