Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38523bf2eb5ee4e…

MALICIOUS

PDF

74.7 KB Created: 2021-03-24 00:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3f578f68c5b7e54a5abf7917b7ac25ed SHA-1: 2cd59f9f2ba59453ab9471a4b6053b42f0531e33 SHA-256: f38523bf2eb5ee4e66517a9c85e8f542fdbb28785066cff48e6c67dbf4bfeed3
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://fobexugelego.getenjoyment.net/how_to_reset_taylor_digital_food_scale.pdf In PDF document text
    • https://cdn.sqhk.co/bivuwusim/gahdij7/85694914868.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxazazul/coovHhc/address_book_templates_free.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/V0jcZgf/elon_musk_rocket_launch_may_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/yjgggev/wabofomade.pdfIn PDF document text
    • https://cdn.sqhk.co/kevejonob/vwbpxhe/ffx_blitzball_recruiting_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/ghBLjj3/absorption_wavelength_of_water.pdfIn PDF document text
    • http://dorugatutaxovi.scienceontheweb.net/nafawobelurepenofogiwi.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/best_reader_app_for_java.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/wb/ENAH/~3/_7yJ53orglQ/wb?keyword=how%20did%20finnick%20fall%20in%20love%20with%20anniePDF link annotation
    • https://uploads.strikinglycdn.com/files/141c1a96-c2d3-4987-b5f0-355367ad5c18/juegos_del_hambre_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/jijinovamemo.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/9329980349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/899d5775-ad6c-4942-b2f2-28b0d5252faa/51930481046.pdfIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_253eb1c0be124bfe8760aac428f7fde7.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_fb7c3f728f414ba39ea948560417ce52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78279474-205d-469b-a945-f230c68e392f/what_kind_of_usb_cable_do_i_need_to_connect_my_garmin_gps_to_a_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/basic_english_grammar_betty_azar_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/char-broil_performance_gas_bbq_4__1_burner.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_f3acc07277194fc08787d2883a2f5c05.pdf?index=trueIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_9d38a94e8e9649e9aef6d1712fe9c960.pdf?index=trueIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_63f3f9ef78a042ffa548f39953aaba54.pdf?index=trueIn 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_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 5012 bytes
SHA-256: 26245034dd25ff2c107d42215214da3cd57300523e65f4ef6207ffe63880e3b9
font_01_sfnt_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 9720 bytes
SHA-256: d85df163a0cf12b9a174ca4259f3437f84dda5b16911911d05830b25e1fbe2fe