Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53636025121f9c9…

MALICIOUS

PDF

75.5 KB Created: 2021-03-15 19:59:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5a402737e2cafbb22980980087f46a2e SHA-1: 2104ac2bcce43013b855c829942ab7eea6c1816f SHA-256: b53636025121f9c92db9b2b919a7303e131e8a09be6f249bc85615d0eb025625
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to a 'child assent form template'. The presence of external URIs and link farm characteristics indicates an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/123?utm_term=child+assent+form+template PDF link annotation
    • http://tokepubex.getenjoyment.net/wofukawokosazavoxade.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/aAgfqij/maze_runner_crossword_puzzle.pdfIn PDF document text
    • https://cdn.sqhk.co/vemonososepa/aichge5/offroad_bmx_racing_stunt_best_bicycle_games_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/wamedexipun/jf1Oijn/crazy_birds_2_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459326/normal_6004bdb895e51.pdfIn PDF document text
    • https://cdn.sqhk.co/papowepu/iUL3MOa/azamara_pursuit_cabin_layout.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366627/normal_600c7674cde91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_77c55cfb414544eeaa302c6adfb1e9a3.pdf?index=trueIn PDF document text
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_f96de5558516456790e6a3593586cfab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/nexikikijugem.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/jesat.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/cotton_bed_sheets_set.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e6dfcda-88bb-4cf7-a46a-4636f289b311/family_feud_game_template_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8360969a-c91c-43b2-923b-028b49ae478f/basib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72c69c03-b53d-4092-b243-39fdf3125e20/mivibakakerosinuxotaxani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e0ef351-8111-4994-adcf-5dbaff4b2542/disasiz.pdfIn PDF document text
    • http://jagomizaf.atwebpages.com/61403851789.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/gukavalozonaruwaz.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_d5380cd4a03c442196316fef92933428.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purawuma/33938732985.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_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 5188 bytes
SHA-256: e927f4f9b3999fe9fe95172266d3e4ffe3a02b84803501ce676dbebb8ecee0a2
font_01_sfnt_off0000fb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 10636 bytes
SHA-256: 6db0ce4e880537bfd1c1633e86639a2e5cb1f4958129ff8d8edbd541956f953f

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