Malicious PDF — malware analysis report

Static analysis result for SHA-256 641e7ac53b839e4b…

MALICIOUS

PDF

75.6 KB Created: 2021-04-05 19:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8542039bfdd7f608b27c36599d3e78e4 SHA-1: 62d764b20ead9452d7e9caac7b6eb511b27aa7ae SHA-256: 641e7ac53b839e4b4e3423f92ae83a7f1b3af1e96e2066a2309bd60b98f89dce
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL designed to trick the user into downloading a further malicious PDF. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of an external URI and embedded URLs points to a phishing or social engineering attack, likely aiming to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/award?keyword=books+of+the+bible+at+a+glance+pdf PDF link annotation
    • http://cetop.xyz/fosepusizigwccj9.pdfIn PDF document text
    • http://iciko.xyz/standard_deviation_worksheet_tesc0gnj.pdfIn PDF document text
    • http://mini-cam-v2.club/77706563085jhocc.pdfIn PDF document text
    • http://topstop.site/basic_command_prompt_commands_windows_10yfxp0.pdfIn PDF document text
    • http://sushibara.net/690156034914t2tj.pdfIn PDF document text
    • http://frasqen.online/weather_report_for_grand_rapids_michiganl94co.pdfIn PDF document text
    • http://flymoney.net/84982250189q33tj.pdfIn PDF document text
    • http://vk-settings-change.online/where_is_power_steering_fluid_on_2011_traverse4cy1l.pdfIn PDF document text
    • http://importants.space/tcl_tv_reviews_32z2fko.pdfIn PDF document text
    • http://damvglaz6.xyz/913888070213v536.pdfIn PDF document text
    • http://gtomishebs.xyz/miles_and_huberman_frameworklc1wv.pdfIn PDF document text
    • http://vosajizegek.mypressonline.com/kowov.pdfIn PDF document text
    • http://takovevagagiv.scienceontheweb.net/imperialismo_definicion.pdfIn PDF document text
    • http://mebets.xyz/bevibuwaniwewipajakebojakwfgn.pdfIn PDF document text
    • http://checkmycredit.info/what_are_active_listening_skills_in_counselingeo1cs.pdfIn PDF document text
    • http://islta.fun/4709739399ogbly.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zetituri/pepaxen.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/dibugaxenepokedog.pdfIn PDF document text
    • http://bafuwujix.atwebpages.com/bejufezunelavixexubofim.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/ielts_plus_3_listening_test_4_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/chinle_formation_petrified_forest.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/rarimilogunutekusakir.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_off0000e7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 5572 bytes
SHA-256: 874b7e4fed6496637f3d39638878528aeaf601d7d2ec03fface57e9a54698fa1
font_01_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 11480 bytes
SHA-256: e87d790f62b58695c1c02bcee691f552937eb6cd953cc6f792811492803ee5e1

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