Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8432a41d1473dc6…

MALICIOUS

PDF

75.4 KB Created: 2021-02-11 15:21:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 297bc4186ef6410d530619f47ef7a6fc SHA-1: 1b5155653ab056c38e0bcd252e55c752fc4b48f1 SHA-256: b8432a41d1473dc6479d8ff790e8f1061869901beabf58c781720eed8cfc9fe3
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to 'https://maypoin.ru/wix?keyword=topics+for+toastmasters+speech+8', which is likely the phishing lure. Although no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript to facilitate malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/wix?keyword=topics+for+toastmasters+speech+8 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5fcefcc3a7b93.pdfIn PDF document text
    • http://all-gopro.com/kebisebabudebeotg5h.pdfIn PDF document text
    • http://axecheat8.xyz/pdf_reader_gratis_windows_10q77ky.pdfIn PDF document text
    • http://idealslim-ordina.site/zulekebevukemi4huua.pdfIn PDF document text
    • http://indir-kazan.com/21235050394iw9p9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451950/normal_6024b3dddfe27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413240/normal_601b7b1ead3eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503524/normal_5fd19bf7c9939.pdfIn PDF document text
    • http://tk-time.site/ghost_hunt_anime_online_streamingjy3gc.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/dogazisuze/75981110774.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/pathfinder_kingmaker_early_game_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/howl_s_moving_castle_ost_violin_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/animal_health_australia_biosecurity_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/99830855442.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/android_app_icon_set.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/85091884361.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/duzopuw.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/fluency_in_english_ba_1st_year_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/90308060671.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/alone_2015_movie_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/gereteseli.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_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 5364 bytes
SHA-256: 5ee3450e8c503fcb0d62c5a37289aac68697bf86009920b6d61443e18e1cd8a3
font_01_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 10364 bytes
SHA-256: da1ca9839c339857c565a83a76acc03fc0921edaab9317704bab2e8adcf0b24c

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