Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25abae5a62f0201…

MALICIOUS

PDF

77.4 KB Created: 2021-03-15 09:26:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 13d82c6c2cd316efe00116d09724255b SHA-1: e46e2323972702f143c4f741609aa5d82c243aa6 SHA-256: c25abae5a62f0201c961f7afdcc556a19f68d508547a5e3847e9d22fe50d93e4
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a suspicious domain, identified as malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure, and the overall structure suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://yafferge.ru/wix?keyword=briose+cu+cacao+si+afine In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411491/normal_60146dbf3089d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474457/normal_5fef63c8777cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_603c6e7d16161.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/36409218973.pdfIn PDF document text
    • http://gevenukodujojov.getenjoyment.net/speco_asphalt_plant.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/a_first_course_in_complex_analysis_with_applications_zill_solutions.pdfIn PDF document text
    • http://ladebizelase.scienceontheweb.net/xujepuvepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://timojodabemisux.myartsonline.com/57635711712.pdfIn PDF document text
    • http://vigigizumobake.rf.gd/20612906945.pdfIn PDF document text
    • http://reditavipesef.rf.gd/my_ryobi_pressure_washer_keeps_shutting_off.pdfIn PDF document text
    • http://lijivuzase.rf.gd/history_of_the_cheese_ball.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/1400842461.pdfIn PDF document text
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_7ca98edc7aa54305816aeda548d08bea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/bafubune.pdfIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_a539b1f266354fc6a5fc41dd404f6b7a.pdf?index=trueIn PDF document text
    • http://nibubatovavav.atwebpages.com/watermelon_man_bass_tabs.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/95040289917.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/dedejonukifugir.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/is_part_6_of_jojo_confirmed.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/1994_honda_accord_ex_radio_code_entry.pdfIn PDF document text
    • http://sedejavuguz.rf.gd/best_free_games_for_android_tv.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_off0000e889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 4892 bytes
SHA-256: 06142d610e783570613b4becbbe93ce0d11e6cdd95f2821573639ed101e2980d
font_01_sfnt_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 11308 bytes
SHA-256: d1044cd6132db98e782615e7d5bd8fb9d0a463094e2cc3ec9231fff0b4c31b7f

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