Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b873632ad3f1f92…

MALICIOUS

PDF

70.6 KB Created: 2021-03-25 11:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4e0dfbe053477a6552694b4433a923f SHA-1: 2be1a3288bf11448ee3fb95fbda157e2d5a84431 SHA-256: 6b873632ad3f1f92ad924af8bc28501db00866cdc9dfcf3f6ce0a05f95aa1c85
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/award?keyword=convertir+de+pdf+a+word+editable+online+gratis
    • http://mujoxoluvisukid.getenjoyment.net/rupufinaredodukugo.pdf
    • http://tanivikovome.sportsontheweb.net/when_can_you_disclose_information_without_consent.pdf
    • http://mepamoso.sportsontheweb.net/35387565300.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lofese/guwagupejisanegosi.pdf
    • https://s3.amazonaws.com/gezizefefififa/gossip_girl_season_2_guide.pdf
    • https://s3.amazonaws.com/werowibovezoje/palemozumitusatejos.pdf
    • https://s3.amazonaws.com/tugafebip/nigeria_criminal_justice_system.pdf
    • https://uploads.strikinglycdn.com/files/ae3267eb-2ea1-499b-9630-44eb3a8e7a1f/el_nombre_de_la_rosa_pelicula_completa_online_gratis.pdf
    • http://molagegivijoxu.onlinewebshop.net/11621833973.pdf
    • https://uploads.strikinglycdn.com/files/56634b14-e617-49bd-bd7e-805e40047e5b/how_to_use_blender_video_editor_for_beginners.pdf
    • http://vawivulumekil.onlinewebshop.net/zoology_books_for_bsc_part_1_download.pdf
    • https://s3.amazonaws.com/nefagolom/accpac_plus_dos_manual.pdf
    • http://megigezorozo.atwebpages.com/calicut_university_contact_number.pdf
    • https://uploads.strikinglycdn.com/files/71096520-7688-4f7c-96c7-37f1496246f5/how_many_years_should_a_central_heating_boiler_last.pdf
    • http://xefiposokupama.myartsonline.com/convert_kindle_book_to_online_free.pdf
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_33c8466fbd0143858f82f497e9a99baa.pdf?index=true
    • https://s3.amazonaws.com/zeworibuzoza/bhopal_express_platform_nizamuddin.pdf
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_09f4d52b09a149e289b36df012674483.pdf?index=true
    • http://wutejaxevewef.myartsonline.com/cfa_level_ii_curriculum_changes_2020.pdf
    • https://s3.amazonaws.com/xuzed/how_to_cook_brown_rice_slow_cooker.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_off0000d5ef.bin
89ac1c34ea4013481e4c82de3a8fe1d8cd8160a9050df79ce3c7a53fd14d508f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EF 5408 bytes
font_01_sfnt_off0000e86d.bin
70c8c53edc327751971e63b5b9851785819f63efa18af7a6296000cc2913778e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 10504 bytes

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