Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d82dd0d50f5e44f…

MALICIOUS

PDF

78.5 KB Created: 2021-01-27 09:23:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1184d3c8f300e9dd13ff330179291e23 SHA-1: e8612d382d874b834556f7d347cd646136240373 SHA-256: 8d82dd0d50f5e44ff036371d92c8b7b1170851bd899c87f33b334594f7fc04fc
96 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, specifically as 'Pdf.Phishing.Trojan'. It contains an embedded URI pointing to 'https://jacksth.ru/wb?keyword=keyboard%20shortcut%20keys%20list', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to keyboard shortcuts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=keyboard%20shortcut%20keys%20list PDF link annotation
    • http://kulokozataxat.22web.org/admission_form_for_school_in_ghaziabad.pdfIn PDF document text
    • http://govnososal.xyz/samsung_notes_not_working_after_update_2020i8m87.pdfIn PDF document text
    • http://gtomishebs.xyz/80349591435dtag1.pdfIn PDF document text
    • http://gayerkan.com/idle_heroes_realms_gateepp5p.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/48273127756zyjkv.pdfIn PDF document text
    • http://podarokinsta365.site/gaveverureretodoriwasejevc7gvp.pdfIn PDF document text
    • http://fruct.space/top_10_best_comebacks_evereg242.pdfIn PDF document text
    • http://metazoaapc.fun/defogeko8jk21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://worubag.epizy.com/74848604797.pdfIn PDF document text
    • http://xubexiv.epizy.com/leave_application_format_for_office_doc.pdfIn PDF document text
    • http://vudunebavibag.epizy.com/77135445153.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/scattergories_printable_template.pdfIn PDF document text
    • http://sipariwemarisu.rf.gd/spreadsheet_compare_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/como_curar_una_amigdalitis_de_forma_natural.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/amanush_bengali_movie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/depezujakude.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 5080 bytes
SHA-256: 9d9fe6246ef4480ab438fde3d6d4935dc597fb48ac0d9a857934b8a86c78a02a
font_01_sfnt_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 14560 bytes
SHA-256: b8c352acb3d8d6c2137727d2de70d9281e35ec9ab18654f4cfdfb5a9800ee9a7
font_02_sfnt_off00011ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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