Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd46e950ce9d4d98…

MALICIOUS

PDF

78.9 KB Created: 2021-02-23 05:24:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: b922ca3d6e8594f655c3db2d68ab9da2 SHA-1: dcf8171015c151f950a6ac79b537180def11e830 SHA-256: cd46e950ce9d4d985ebccf77a9330462d3a146ddb6880cf9ada23d9b23d93eb6
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'jacksth.ru', which is likely a malicious domain used for phishing or distributing further payloads. The document body, though partially corrupted, contains text related to the embedded URI's keyword, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=milk+is+a+homogeneous+mixture+and+scatters+light PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456121/normal_601ec39773d51.pdfIn PDF document text
    • http://neyroskakalka.site/312832967148qwnw.pdfIn PDF document text
    • http://twobigs.space/aesthetics_definitionc4inl.pdfIn PDF document text
    • http://manekobe.22web.org/jipogukebex.pdfIn PDF document text
    • http://allostar.buzz/sims_4_update_3_september_2020jr4q2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466398/normal_5fe923d4848ef.pdfIn PDF document text
    • http://sazaleve.22web.org/tui_sutherland_wings_of_fire_series_order.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/AjfXKhg/backhand_serve_badminton_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/0jdNCdL/brilliant_word_meaning_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/Ep1rhaB/28880354541.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/jcH8lhd/resident_evil_movie_chris_and_leon.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/lonozote/wonderwall_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/email_address_format_for_business.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/2019_bls_guidelines_aha.pdfIn PDF document text
    • http://bozalusi.epizy.com/72647667058.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/beyblade_burst_turbo_game_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/92092225654.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/10594997805.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_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 5488 bytes
SHA-256: 314ab2a40a8918ec7860174b05aabe08f15167156480005ae7346b15dcc7b122
font_01_sfnt_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 10656 bytes
SHA-256: b84bd57954dfe8b880453089c9362b71683b26f79a00011b51a2ff9a25bd2142

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