Malicious PDF — malware analysis report

Static analysis result for SHA-256 de71baa8ff7dff78…

MALICIOUS

PDF

87.0 KB Created: 2021-03-12 08:36:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0000cd774104bffbac012327a5e856f3 SHA-1: d19f227f5bc620503e2ec7e20e98884956574e45 SHA-256: de71baa8ff7dff78467beb7e6114ae16a03ad92c0b23959e8bc0290cbc232bea
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO link farms or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and the presence of many external URLs suggest it's designed to lead users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/award?keyword=dependent+prepositions+exercises+advanced+pdf PDF link annotation
    • https://cdn.sqhk.co/muribirigim/rHhgOKO/272927704.pdfIn PDF document text
    • https://cdn.sqhk.co/wejafivelij/YjiKjdc/mofatakuxadebopiruxan.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/81243699605vs3vv.pdfIn PDF document text
    • https://cdn.sqhk.co/girasufu/WVZ6Vgi/photography_hashtags_for_instagram_2020.pdfIn PDF document text
    • http://operationhomeplate.com/27877890048lemga.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/igShhif/callaloo_recipe_trinidad_style.pdfIn PDF document text
    • http://trysoda.pro/34273147723kzur6.pdfIn PDF document text
    • http://reduslim-ordina.site/58540893135921it.pdfIn PDF document text
    • http://icub.tech/midsummer_nights_dream_act_5_short_summaryls0y4.pdfIn PDF document text
    • http://serviceforyou.site/drifting_games_pc6gau7.pdfIn PDF document text
    • http://lessonsonline.site/gilapuzoradubojyol1.pdfIn PDF document text
    • http://teksalon.xyz/dyson_dc35_type_b_manual9asva.pdfIn PDF document text
    • http://skout.tech/s_letter_status_songbpaq4.pdfIn PDF document text
    • http://merishwheelrecords.com/engelsons_falkenberg_storleksguidem9mvl.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/gekixadonuru/carmen_habanera_sheet_music_violin.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/43495574052.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/83106773118.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/minecraft_game_free_for_windows_7.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_946bf294f8aa4a8eacd5ec1f5855194c.pdf?index=trueIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_45b9566ed3804aa69e6046d01fe70463.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosagoba/best_website_to_movies_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/59015387107.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_dc940c65c6ce448f8291bc7c112575bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/13814468552.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/30348128908.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_off00011955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11955 5244 bytes
SHA-256: d81a048e7d694f245a7a6ad845f55a02cdef392b25ae77ae48eba6fcd673652b
font_01_sfnt_off00012b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4A 10200 bytes
SHA-256: 3a74833bb52770d44b92cd35816d679be39bbb4d9da5f4cf147683843f068a7f

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