Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec466608fb115ab…

MALICIOUS

PDF

76.5 KB Created: 2021-05-01 23:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 16d0093cdc291a4cf31ec707b7781fef SHA-1: 4428b3d5f7384904dac0b7e862e3f40358f4fb42 SHA-256: 5ec466608fb115abfbf8b8136a4802a306e05474f1f6a796acbf54ebed3dcd79
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically. The numerous embedded URLs pointing to disposable domains indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=dell+u2913wm+manual+pdf In PDF document text
    • http://crystal-light33.ru/subaru_ea190v_pressure_washer_for_sale2bghn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_606ddb7d92aea.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/dIhjghf/livestream_or_live_stream.pdfIn PDF document text
    • https://cdn.sqhk.co/womelage/hdYhdih/pilopevuxer.pdfIn PDF document text
    • http://national-verifyteam.com/how_to_set_robertshaw_thermostat7jw37.pdfIn PDF document text
    • https://cdn.sqhk.co/vutazazu/hiPLpI9/color_tunnel_2_player_games.pdfIn PDF document text
    • https://cdn.sqhk.co/tedefoso/8bjcfOw/dabopomaj.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/tratamiento_para_acidosis_respiratoriag007f.pdfIn PDF document text
    • http://bloodcraft.online/internal_combustion_engines_applied_thermosciences4wjxr.pdfIn PDF document text
    • http://infonewstravel.com/tableau_de_conversion_metre_cube_en_litrenqjjd.pdfIn PDF document text
    • http://edevletorg.com/85762155432mcxul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401525/normal_5fd34f96a3a04.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/a737b420-33cd-4bb0-935a-7332d3ff3d3f/mugisegifirufig.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/gilopexavukebazikurusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e181fd-2343-4b4b-bc19-312acb402f8a/envision_math_2.0_grade_4_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/what_is_the_role_of_separation_of_powers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd17956-fb69-482c-8201-e9adc1872ad7/liveranesifatojerasaza.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_off0000e746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE746 5508 bytes
SHA-256: 025547cde434dd059e281b5c853a1f13356f11e3f14b76a7222fd2c79a4e9559
font_01_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 14036 bytes
SHA-256: b62aaeb009b7655f12ca2d110a58593d14f9328cb20b5178be6593bb7bac18dd

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