Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f8aa738166d797…

MALICIOUS

PDF

77.3 KB Created: 2021-04-05 13:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c16b645f89de8aef39fa11dbdb6e78a8 SHA-1: a95e3572813fd8f67114d6e108c18c88ce5229dc SHA-256: d9f8aa738166d797a804a3cb7e8022a21d3eb9dd7f9d69376cbee65d2c493887
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it's a phishing trojan. An external URI, 'https://maypoin.ru/wix?keyword=fraction+of+amounts+worksheet', is embedded within the PDF, suggesting it's used to deliver a payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=fraction+of+amounts+worksheet
    • https://cdn.sqhk.co/zitedefew/gejdEsX/31591587419.pdf
    • http://romeita.space/change_default_music_player_applexvjuh.pdf
    • https://cdn.sqhk.co/fosuzonarefi/fhLV2hg/android_back_button_click_programmatically.pdf
    • http://rululidevasuv.22web.org/aprendizajes_clave_secundaria_artes.pdf
    • https://cdn.sqhk.co/tosuwukiwate/IRherhi/jukemawovisugef.pdf
    • http://deemonatrafik.xyz/mavulakexawajicbwyu.pdf
    • https://cdn.sqhk.co/kibukumivu/hghjm8B/xigoju.pdf
    • http://bilkaita.space/49533780322wvpz8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a4385c10-93cc-40ee-803b-f08ee70e34f7/regozejamolawaxupopafab.pdf
    • https://uploads.strikinglycdn.com/files/129cb353-5fac-423b-b873-48f9b95980a4/59447401935.pdf
    • https://s3.amazonaws.com/kisimujuk/telurik.pdf
    • http://sojusubelifaf.epizy.com/bilal_ibn_rabah_biography.pdf
    • http://dakelajipupak.epizy.com/calling_sehmat_book_download_free.pdf
    • http://fakodesugi.epizy.com/dovoniserori.pdf
    • https://s3.amazonaws.com/dugibabafod/dd_classes_5e_wiki.pdf
    • https://uploads.strikinglycdn.com/files/f48715eb-15cd-4e78-bd39-8e06a333d489/resistor_color_code_calculator_download_software.pdf
    • http://sulifuzefusuw.rf.gd/number_line_printable.pdf
    • http://voperafabekom.epizy.com/gotagiwiwasivatutadofoxik.pdf
    • http://tobopazaxe.epizy.com/sat_punctuation_test.pdf
    • https://uploads.strikinglycdn.com/files/ae71d5bc-183f-4857-9c3d-adcb2d8f5d4e/refamolazapenatiposugetol.pdf
    • http://jidumefimu.rf.gd/kasomogoj.pdf
    • http://pubitawiwinas.rf.gd/weather_app_free_for_android.pdf
    • http://numivonef.rf.gd/break_even_analysis_lecture_notes.pdf
    • https://s3.amazonaws.com/jotizifime/what_are_folkways_answers._com.pdf
    • https://s3.amazonaws.com/tokatefozude/nutufazadujovojafinoz.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_off0000f087.bin
d2c1ac17ef04948e8d23bab28a1a839e35590b69beb62800af32bcbf65f788ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 5200 bytes
font_01_sfnt_off00010220.bin
5cbae68e9e4fbd9d109d10ea841a286dfc607ac8de9717c538ac90f8f9877264		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10220 10852 bytes

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