Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad938628d21e810e…

MALICIOUS

PDF

76.4 KB Created: 2021-04-01 15:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 651fbf5410f4c6bdd5d4895ccdf01bcb SHA-1: 5a756161e669132bb435c7a1d838a1a4bf678b16 SHA-256: ad938628d21e810ece601ed35dc57827aeea4798ab2761f3cda9d93537a499ee
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://seumenha.ru/strik?utm_term=where+the+wild+things+are+movie+review PDF link annotation
    • http://susurrus.space/41847782947mya68.pdfIn PDF document text
    • http://arfesopt.com/body_for_life_dads_green_chili_recipet58u8.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn.sqhk.co/kelufuro/acifgiF/wood_cutting_service.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/aijPIgh/maze_world_3d_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/giripiponi/hdjaiab/nba_g_league_ignite_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/zolokike/V6HUxhV/89106039993.pdfIn PDF document text
    • http://airet.space/11429682063q4o5b.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/75ejcFw/economist_intelligence_unit_internship.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/sefiwegegagu/29304303421.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/pemegafujekag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df992dde-b132-40dc-a758-a32f4d9ecf71/the_other_side_of_the_door_movie_free_download.pdfIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_5473dec6acfd45f2bd3245eff565f5fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/365163ed-99b6-4361-b0fd-c59d3ebca3af/how_can_i_make_excel_run_faster.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/the_diamond_of_darkhold_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ce41041-5666-433b-96be-2ac63db9307d/kagalopinokufekifufatibop.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/52401951701.pdfIn PDF document text
    • https://dcaf3b11-26f0-4e60-b842-01857b8e1462.filesusr.com/ugd/2df88f_dfb30145286142a28e521b5c4964f434.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/cambridge_latin_course_unit_1_stage_8_translations.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/quotation_attached_letter_format.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/convert_to_uppercase_in_excel_sheet.pdfIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_56396b8d7ca449c48d675658d2dd7e0c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f223f47-9cac-4c90-ae51-0181fa1b56f6/eclipse_180_pro_mp3_player.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_675f90e31ead4cf2a235b9bf1e4bf87c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divikufifir/tabaxedunasotowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a796e17d-4fbd-4eb1-8f26-a822597aa773/basic_radiological_physics_k_thayalan_download.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_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 5404 bytes
SHA-256: a04409a1a8bda36910d36d7b7c4fb3ec910b46ca251001a1ec5ad4e94f83a3d1
font_01_sfnt_off0000ff08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 10880 bytes
SHA-256: dc56707b6b9466236b79561a73a1f76ad259c31f8f3fe0c377b38cc24fabddf9