Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e537b6e77059dea…

MALICIOUS

PDF

79.2 KB Created: 2021-03-16 10:54:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cf5977a38faa2099701b0d5e0731083 SHA-1: bba4cce7b083dd1647651bc4d70bf0b9c9b9ff32 SHA-256: 4e537b6e77059dea918370a87bbd43f372cc7113f0d23889645d6afa3348cd15
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that contains an embedded URL pointing to a potential phishing lure. Heuristics indicate the presence of external URIs and a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the external URL used in the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/award?keyword=ansi+code+pdf+download
    • http://fafijitesulexiz.mygamesonline.org/64127629527.pdf
    • http://gisisavodure.22web.org/namisitaduwinusasasi.pdf
    • http://maxobujixeweden.sportsontheweb.net/bach_cello_suite_1_guitar.pdf
    • http://dakisemakegag.sportsontheweb.net/sewogaboloniviwejebimig.pdf
    • http://zugapuvu.mywebcommunity.org/modo_congiuntivo_e_condizionale_del_verbo_innaffiare.pdf
    • http://xulodol.mygamesonline.org/wusupemavababab.pdf
    • http://rimiripa.mypressonline.com/english_language_teaching_method.pdf
    • http://jelusuvobirolen.mywebcommunity.org/bojik.pdf
    • http://rabekapudi.iblogger.org/25605405252.pdf
    • http://gopidap.scienceontheweb.net/stock_market_lessons_for_beginners.pdf
    • http://ziwegiwe.iblogger.org/bertrand_russell_the_conquest_of_happiness.pdf
    • http://dixurujisefumet.22web.org/jeopardy_sheet_music_violin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fuvovidesom.epizy.com/70797578942.pdf
    • http://lodumojokexiku.onlinewebshop.net/gillette_fusion_proglide_styler_manual.pdf
    • https://s3.amazonaws.com/wukara/google_play_music_sd_card.pdf
    • http://pekomuvave.myartsonline.com/5099948896.pdf
    • http://kesexawes.rf.gd/guzebinukadevibedojib.pdf
    • http://jusapirizut.rf.gd/18610083879.pdf
    • https://s3.amazonaws.com/legipalofi/harry_potter_and_the_half_blood_prince_movie_length.pdf
    • http://rowoniwetob.atwebpages.com/69389409872.pdf
    • http://nowakimelufumi.epizy.com/how_to_convert_linksys_wrt54g_to_be_an_access_point.pdf
    • https://s3.amazonaws.com/juzinaramip/acoustic_wave_equation.pdf
    • https://s3.amazonaws.com/fobupojowojon/net_speed_monitor_app.pdf
    • http://pilevujomeludo.rf.gd/learn_coding_for_free_reddit.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_off0000f8c6.bin
c645c28c09af11b90cc644dc6eac90e91f045247f77fe4cd7db9a2bcfef9f874		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 5136 bytes
font_01_sfnt_off00010a6e.bin
ac0df515e7629455e09495ffbacbe19d6ee26bd05085c0873807cd431220662a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 10896 bytes

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