Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a9102f27caa49e…

MALICIOUS

PDF

75.0 KB Created: 2021-03-18 14:17:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3e4424adf82530abde09cc6720879727 SHA-1: b9b7dd618a5f71bab4be60e74463b5d2261133a7 SHA-256: 87a9102f27caa49eca3da006c5bbaf23d7b559cbb69ac52d7d8fb150b0fe7f75
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a website offering a worksheet, which is a common lure for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of external URIs and the overall detection suggest the document is designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=probability+tree+diagram+worksheet+and+answers+pdf PDF link annotation
    • http://wanezus.scienceontheweb.net/21551596663.pdfIn PDF document text
    • http://tuwukadinem.mygamesonline.org/a_first_look_at_communication_theory_10th_edition_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/hbdjfhj/red_ball_4_gameplay_adventure.pdfIn PDF document text
    • http://filexupop.iblogger.org/coastal_alabama_community_college_course_catalog.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/jenhaji/emojination_3_emoji_game_download.pdfIn PDF document text
    • http://gawudubigojan.getenjoyment.net/bratislava_map.pdfIn PDF document text
    • http://zosoxefu.22web.org/how_to_relieve_bloat_from_overeating.pdfIn PDF document text
    • http://tizelobira.22web.org/liwoxoxudinaluka.pdfIn PDF document text
    • http://duperalenow.22web.org/zoxew.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/libro_completo_colorin_colorado_este_cuento_aun_no_ha_acabado.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/buponuwebi/kalonumeloki.pdfIn PDF document text
    • http://solejow.myartsonline.com/lipasawatunugukidu.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/what_are_the_differences_between_fitbit_charge_3_and_4.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/xawovosi.pdfIn PDF document text
    • http://xakazasaravi.onlinewebshop.net/abdul_qadir_jilani_books_english.pdfIn PDF document text
    • http://sewuxuta.rf.gd/14936740278.pdfIn PDF document text
    • http://puxejinasor.epizy.com/33727538426.pdfIn PDF document text
    • http://tuvebiz.rf.gd/toxic_britney_spears_clarinet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/96498561706.pdfIn PDF document text
    • http://mekasesajiw.onlinewebshop.net/armorial_general.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_off0000e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 5856 bytes
SHA-256: a9bcdee918cf6b3028e8f71fae4d5617117d24bb43d31a2af62b844fbd3b8099
font_01_sfnt_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 10856 bytes
SHA-256: 0b4e57c63bbc0637ef0bf611272050165ecab07d9569d727bdd89a0a15d1bc31

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