Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf40d1cd9d4d6ca0…

MALICIOUS

PDF

116.0 KB Created: 2021-03-20 05:59:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a53e5832805b9745cb1c37edff459b19 SHA-1: 02cc3f0b90b54bca06e1fa0e3f396d40680f81f7 SHA-256: bf40d1cd9d4d6ca029a2b83a11aa3894be7e05c3d061d160c540a1751235fdad
134 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The document's structure and embedded URLs indicate an attempt to trick users into downloading further malicious content by impersonating educational resources. No scripts were extracted, but the presence of multiple suspicious URLs points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://pelibifir.ru/award?keyword=saxon+math+algebra+1+book+pdf PDF link annotation
    • http://3bki.ru/foxowamilotujuvebr1ank.pdfIn PDF document text
    • http://wikowezenitezo.medianewsonline.com/math_binomial_theorem_solution.pdfIn PDF document text
    • http://mexawolin.medianewsonline.com/najukovo.pdfIn PDF document text
    • http://wekeb.space/different_kinds_of_process_flow_diagramk0uzk.pdfIn PDF document text
    • http://bigpleasure.ru/how_to_take_apart_a_keurig_k_mini8wnt3.pdfIn PDF document text
    • http://generalmassage.online/fimakarabemivaziriredltts.pdfIn PDF document text
    • http://instasurprise.online/twilight_breaking_dawn_part_2_final_battle_scene_fulld3ubb.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/savafedemosu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/68ecf5bd-56bd-4db1-a40e-62a6850ee9d7/bitusekogifemetimokasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73f8f03d-214c-44d7-b18f-ca62591bcf35/tidijegewumiroleparon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e42bf7dd-701e-42ec-a51e-cc0fea447a92/don_juan_canto_1_summary_in_bangla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e1d1f6-ea70-42bc-8751-4bb01e428238/how_to_report_my_ebt_card_stolen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b331ec-3c74-4661-86d0-da6d04bc5793/monkey_wrench_gang_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9873d184-84cc-4145-8ba5-5d774408ff4c/best_places_to_play_dd_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90bb17fd-d869-4476-ac13-9b13a1bd0544/varexapunosesamenararet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cf56633-0975-4d7c-8339-fc4d9de9dd4e/21_laws_of_leadership_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c33422f7-0bf0-48cf-bd8d-62ddcd45e3be/3379721923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/140b7a1f-7a86-495c-8a4b-db9eb56ea221/jakosej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ddb743b-c27f-4fdf-9c0d-25f839f7b8c6/9924504017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a4e0a9b-efc0-403e-b8ba-d1b7eb830092/libro_azul_de_alcoholicos_anonimos_capitulo_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c817e2-3d5e-41e9-910d-350bbe3e78b5/mumomalujaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8126b73-ab8d-4ccf-965a-a1c6dcec359f/giwawunereviriwabo.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_off00018690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18690 5704 bytes
SHA-256: 8359ed3b96e4a828f959b06cca49405b5ec02c4367844793c7f682465e80a44b
font_01_sfnt_off000199d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199D5 11500 bytes
SHA-256: e9e5e7393c80f3f5ff96f3435a061dbba5798346bde0e404f919152f8c5ae73b