Malicious PDF — malware analysis report

Static analysis result for SHA-256 9636fe49e9976e2b…

MALICIOUS

PDF

79.8 KB Created: 2021-06-14 12:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eed379155d086d8dabb176a5bb3e3662 SHA-1: db205a03724ad10ea9ca27d5dd1fca1d3e95e2ac SHA-256: 9636fe49e9976e2bdc5b6de5fa9e2989e9bc3eeae6b5a51935a25633b846d2d1
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, with a high risk score. It contains an embedded URI pointing to 'inwebjor.ru', which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of an external URI in a PDF is a strong indicator of malicious intent, often used to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://inwebjor.ru/pbw?utm_term=game+of+thrones+english+subtitles+season+8
    • https://cdn-cms.f-static.net/uploads/4365607/normal_60bd8336436a8.pdf
    • https://cdn-cms.f-static.net/uploads/4405437/normal_603c399744c6a.pdf
    • https://static.s123-cdn-static.com/uploads/4481271/normal_5ff698e2f3582.pdf
    • https://cdn-cms.f-static.net/uploads/4366043/normal_60c6ffd5cf691.pdf
    • https://cdn-cms.f-static.net/uploads/4423452/normal_602ab2b18408a.pdf
    • https://cdn-cms.f-static.net/uploads/4369926/normal_60c610ba7952e.pdf
    • https://static.s123-cdn-static-d.com/uploads/4390051/normal_60b1ad6f3d486.pdf
    • https://static.s123-cdn-static.com/uploads/4445114/normal_5fecf858f29d0.pdf
    • https://static.s123-cdn-static.com/uploads/4368501/normal_5fdf9f4b5c591.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ee72c742-932f-49e9-b845-39add76375c7/minister_license_online_tennessee.pdf
    • https://uploads.strikinglycdn.com/files/e68a7ca1-aae0-4169-9040-efccde6286f7/how_great_thou_art_chords_elvis.pdf
    • http://pusavivo.pbworks.com/f/50158890153.pdf
    • http://zixereves.pbworks.com/w/file/fetch/144687789/solicitud_de_empleo_econo.pdf
    • https://uploads.strikinglycdn.com/files/6eca49fa-3cf3-4d38-886c-4790709163c4/nikon_55-200mm_f_4-5.6_g_ed_vr_review.pdf
    • https://uploads.strikinglycdn.com/files/067d0b2e-055d-4a9d-a856-e5ea3c322d5a/31103671659.pdf
    • https://uploads.strikinglycdn.com/files/d50c4b84-c508-41b6-b256-119c3d3df411/10773291172.pdf
    • http://ziludezubeju.pbworks.com/f/a_passage_to_africa_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/8fc39726-81b9-4823-926f-145f3d34b271/2008_dodge_avenger_issues.pdf
    • http://fisojun.pbworks.com/f/tom_and_jerry_movie_2021_running_time.pdf
    • http://tozuxexap.pbworks.com/w/file/fetch/144518103/how_can_i_install_netflix_on_my_ipad_2.pdf
    • https://uploads.strikinglycdn.com/files/4f09b0ba-34f1-4ded-aee2-0b1010680bc4/89357196988.pdf
    • http://pebokuvog.pbworks.com/w/file/fetch/144702081/8_bit_music_maker_software_download.pdf
    • http://wusagem.pbworks.com/w/file/fetch/144447426/26020802426.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f956.bin
6cc475033ab47a8b4123d0b4f585217781abfff85ca6ac4efa542d6714131ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 5548 bytes
font_01_sfnt_off00010c08.bin
6ffe7529139e78691f9da64b7c179a0a3377cfade6f72c8ecea12f00557232f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 11104 bytes

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