Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83d66a62475c0d8…

MALICIOUS

PDF

76.3 KB Created: 2021-04-10 07:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63629ad14ad1bfc254f52eea77d9bb3e SHA-1: b6408c6eed58be1fd0cd0672add0c10971e5801e SHA-256: b83d66a62475c0d8354ec60e75ec9a1aaa17956c29d39907f535c6fafeda7e65
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains an embedded URI pointing to 'zajinet.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to a Christmas piano tutorial, aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=have+yourself+a+merry+little+christmas+piano+accompaniment+tutorial
    • http://waystep.site/91082376134hymrb.pdf
    • http://bestpriceforukraine.xyz/how_to_analyze_data_in_research_proposal1v27v.pdf
    • https://static.s123-cdn-static.com/uploads/4473031/normal_5fdc9928daaff.pdf
    • https://cdn-cms.f-static.net/uploads/4403539/normal_6028206dc9467.pdf
    • https://static.s123-cdn-static.com/uploads/4403556/normal_5fce8a2479046.pdf
    • http://tixshopclub.space/31634965964zk9l4.pdf
    • https://cdn-cms.f-static.net/uploads/4450509/normal_6058dbc28f5a1.pdf
    • http://awpmode.com/childrens_sewing_patterns_boutiqueiuxfd.pdf
    • https://cdn-cms.f-static.net/uploads/4445737/normal_600d473dd7588.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wozowuledij/android_vs_iphone_user_statistics.pdf
    • https://s3.amazonaws.com/tojabixefova/how_to_fix_my_mr_heater.pdf
    • https://uploads.strikinglycdn.com/files/f9658215-56a0-4018-bcca-e4fbf63a5fe4/cuisinart_k_cup_coffee_maker_not_brewing_full_cup.pdf
    • https://uploads.strikinglycdn.com/files/93ec3a87-024b-463c-83af-8b4bcd3121a9/what_is_taco_bell_red_sauce_made_of.pdf
    • https://uploads.strikinglycdn.com/files/1bd47f39-b38e-4e29-a93e-ee734418a1ef/soxutuvarames.pdf
    • https://uploads.strikinglycdn.com/files/b357ef83-312f-4aa9-85d0-2b942466eefa/how_to_analyze_sales_data_in_python.pdf
    • https://s3.amazonaws.com/najubu/65363800594.pdf
    • https://s3.amazonaws.com/lorifumofelu/sony_dav-dz170_service_manual.pdf
    • https://s3.amazonaws.com/zedilegol/cicala_e_formica_castelvecchio.pdf
    • https://s3.amazonaws.com/dudujopixejikug/infographic_templates_keynote.pdf
    • https://s3.amazonaws.com/supefujoxopubu/wituraneluwalakeluwuwu.pdf
    • https://s3.amazonaws.com/vigevot/towiruvuka.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea7e.bin
f78b81172382fa88acd928f8600b1428373f7a9a619a7bf8134b2913c762aa0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 5376 bytes
font_01_sfnt_off0000fcae.bin
505d25e03ae361d61cd2a57fa1e89810759765dabc4c37b1892c72cde761819e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 11716 bytes