Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8cc08a88a5b82c…

MALICIOUS

PDF

74.4 KB Created: 2021-02-05 10:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 35131188f4cab2ef26cadd19642c7bca SHA-1: 9418276c0409eff170619d97418ae0b3bfddcc13 SHA-256: fb8cc08a88a5b82cec49340c0b4d13b6a82cb90f3d0cc4f6f1f42972cb0028d0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm for SEO manipulation or to host malicious content. One of the primary external links, 'https://maypoin.ru/wb?keyword=oxygen%20saturation%20levels%20nhs%20guidelines', is likely a lure to a phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wb?keyword=oxygen%20saturation%20levels%20nhs%20guidelines PDF link annotation
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/132727d6a.pdfIn PDF document text
    • http://proflist-briansk.ru/descargar_geometry_dash_world_para_pc_sin_emulador0auvu.pdfIn PDF document text
    • http://tourist.fish/msc_computer_science_entrance_exam_question_papersqt4au.pdfIn PDF document text
    • http://salea.site/grays_anatomy_for_students_3rd_editionbgf16.pdfIn PDF document text
    • http://ekzo-fruit.ru/f1_manager_game_tips2lz22.pdfIn PDF document text
    • http://operationhomeplate.com/iphone_notification_sounds_mp3_free_downloadr23hp.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/siwixomudit/8467222169.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/logo_quiz_level_answers_7.pdfIn PDF document text
    • http://mifazafodig.rf.gd/lajupaliwuwudakidena.pdfIn PDF document text
    • http://wexoloxi.rf.gd/tijuzodusededesas.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/hallelujah_trumpet_solo_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/abscess_formation_in_lungs.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/nanagegusuwevope.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/sepsis_guideline_2019.pdfIn PDF document text
    • http://wolaniloko.epizy.com/if_conditional_type_1_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/94457405256.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_off0000e52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 5344 bytes
SHA-256: c5ac20b9138a1d63efb532649772665457c37198848cc5304d4b91b65404e996
font_01_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 10736 bytes
SHA-256: a7484e2af634bea050c33a453c9e67cdec9a812701bb06f18a06f4913c54eff5

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