Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a63f02f3398050…

MALICIOUS

PDF

81.1 KB Created: 2021-03-30 04:40:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2dd5a38c3039deb7e5b41dba221d830a SHA-1: 75e46ffe738e0ce086bedcbaf5da38848134aa07 SHA-256: e9a63f02f3398050485b96d28599724cb68ebc85eff1f3c25b02737b5d7d2538
186 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 0.9998

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 https://ponafet.ru/aws?utm_term=diary+of+a+spider+journeys+pdf PDF link annotation
    • https://cdn.sqhk.co/bogulevim/c74ifgf/johnny_jetpack_game.pdfIn PDF document text
    • https://cdn.sqhk.co/tajaketo/CbiggiX/36666376589.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/ijijhdQ/best_rally_game_ps4_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/gfrjiJq/99962459157.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/bQEghjg/street_hockey_goalie_pads_for_sale.pdfIn PDF document text
    • http://tiktoktop.design/quadratic_inequalities_worksheet_answer_key5x9du.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/zAHjcAb/rrb_alp_stage_2_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/dgiTxhi/lisibezajosanapi.pdfIn PDF document text
    • http://shtancircul.site/97047469795cvk8w.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/17a63877-bf32-4e4a-ae47-702911199d1f/47825297773.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/dbt_skills_training.pdfIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_28064e52cab44c3397cd99ca75b89bac.pdf?index=trueIn PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_3d46885a1149422fb6ae51cb6683f198.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_1929c646212c4b69b86d9f32867c71ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bakoloj/best_digital_photography_magazine_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b586158-1055-49e8-bda2-63016c5e2282/wodazesomoloburavor.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/errant_hunter_soul_weapon_guide.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_99641312dd254baf98daed919945b667.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitozi/imo_app_free_for_phone.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 5180 bytes
SHA-256: 2444cad78e7fcdbe303cd3e3647e9fa4db2e3fadd831e2ab6fb0a536a088873a
font_01_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 11040 bytes
SHA-256: 3ecf45843b6500f7d149d8d7059fbe03f870e2802c7834a492a2f6e781ef35a5
font_02_sfnt_off000120ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 16328 bytes
SHA-256: 78493034c033d0861782d53997b784eeb14f7cecaab48b0f43681cd7da4d5e88