Malicious PDF — malware analysis report

Static analysis result for SHA-256 3781bf381a1d5a9f…

MALICIOUS

PDF

73.2 KB Created: 2021-03-08 21:22:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22a2b73374d6425666ef29dca30dc884 SHA-1: 8440f49834d1a8664752bc6d6af276b99028136a SHA-256: 3781bf381a1d5a9fa6169687c6f937e1aff421b063cb6174c8ddd5f2231a8835
104 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of external URIs, including one that appears to be a phishing lure, suggests an attempt to trick the user into downloading a payload. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/wix?keyword=millard+fillmore+apush
    • https://cdn.sqhk.co/baxorurifina/jashhif/league_of_legends_wild_rift_beta_update.pdf
    • http://miwodenexiz.iblogger.org/equatorial_climate_graph_worksheet.pdf
    • https://cdn.sqhk.co/degawatoze/ifbjbgc/italian_american_football_league_2019.pdf
    • http://matizaw.mywebcommunity.org/netters_surgical_anatomy_and_approaches_download.pdf
    • http://gejokakop.mygamesonline.org/friedrich_nietzsche_god_is_dead_book.pdf
    • https://cdn.sqhk.co/nerutamar/iZhjbgd/crossword_heaven_solvers.pdf
    • http://xariketixagat.mypressonline.com/hp_laserjet_4200_maintenance_kit_part_number.pdf
    • http://mowefopovog.mywebcommunity.org/cuantos_pies_cuadrados_tiene_un_metro_lineal.pdf
    • http://sifinujox.sportsontheweb.net/muvubikuwupasiwige.pdf
    • https://cdn.sqhk.co/rivitovolu/ichiNie/rainbow_boa_snake_for_sale_uk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/radubozufiwo/gupegogidagatelazo.pdf
    • http://sogivuwe.onlinewebshop.net/62456765845.pdf
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_9dff689e6d3d4dfcae150d30cc13f0fe.pdf?index=true
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_98166bf1b03142f891a5d235a8d19487.pdf?index=true
    • http://gutekuretejapoj.onlinewebshop.net/xusexijikifefagowe.pdf
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_4f99afd204e24342bdb7a2d5432e2cad.pdf?index=true
    • https://s3.amazonaws.com/xufaxoferugod/bilesefujoge.pdf
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_9795cca3b47d48c0a59fe1bf49870e00.pdf?index=true
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_5b8ffd1dec9146538b36a59fde1caa6c.pdf?index=true
    • http://vojebijawutirus.rf.gd/87_yamaha_moto_4_350_engine.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_off0000e343.bin
33a995e8184719b02d38a18c8bc43592ce85b217281a58dfec199d962b041697		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 5284 bytes
font_01_sfnt_off0000f518.bin
b3f9de558b0b9bda000b87a486e85abfa9db1dc1fd0d217861b25f4e2724b8b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 10248 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.