Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94b300d0c37cf82…

MALICIOUS

PDF

77.5 KB Created: 2021-06-09 04:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e32b1689d19c5b691fa9693a4fedc8eb SHA-1: 33d39ed86b79d64639738454213e8f849a21f3f5 SHA-256: c94b300d0c37cf82e2ace76e49bc1058a0a0ae1544359aa2b6e6e62087e9d4fb
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a malicious intent to redirect users to various sites, one of which is jacksth.ru. The ML classifier and ClamAV detection strongly suggest maliciousness, likely related to phishing or malware distribution.

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 https://jacksth.ru/123?utm_term=mulching+sheet+manufacturers PDF link annotation
    • https://fifitedogij.weebly.com/uploads/1/3/4/7/134747960/bibomuvu.pdfIn PDF document text
    • https://pilumana.weebly.com/uploads/1/3/2/6/132683063/zemajeluremixanoko.pdfIn PDF document text
    • https://xebutikud.weebly.com/uploads/1/3/0/8/130813588/4360078.pdfIn PDF document text
    • https://fejegexe.weebly.com/uploads/1/3/4/6/134617501/dimosisenodar_xofapabewozo_lunanegakow.pdfIn PDF document text
    • https://wetebaxa.weebly.com/uploads/1/3/4/3/134343617/5635672.pdfIn PDF document text
    • https://miwidikanizi.weebly.com/uploads/1/3/4/0/134016908/9e8e6763b5d.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/022b6dc0-8b5d-4782-b101-5bd3ba244416/beherit_drawing_down_the_moon_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a54dd6bb-e9b4-4d93-8e66-2d533435d2c3/xigesidaxulejobijalel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b1e364-a88c-4223-9fd6-f3d40ee5e6f1/vezarofoxigumugixuviji.pdfIn PDF document text
    • http://sowenux.pbworks.com/f/57656240680.pdfIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144667299/group_theory_in_physics_wiki_tung.pdfIn PDF document text
    • http://figuduvimeti.pbworks.com/f/xorotawepomidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71af4207-9d46-4a70-9033-c198070412ea/74342688856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63ce72aa-2649-4041-8a54-b08b8fb02e13/what_is_the_purpose_of_the_emotional_guidance_scale.pdfIn PDF document text
    • http://sutodoromar.pbworks.com/f/2_ejemplos_de_epilogo_cortos.pdfIn PDF document text
    • http://bukafag.pbworks.com/f/kaththi_sandai_full_movie_download_cinemavilla.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144412803/freundlich_adsorption_isotherm_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53cfa372-9150-4b4c-8170-8e5eb7b73ff3/dbx_160sl_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad0adc5-aa50-4991-a1ac-e22797e2f17a/how_can_i_learn_self_control.pdfIn PDF document text
    • http://jebusolole.pbworks.com/w/file/fetch/144895776/worksheet_of_descending_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae72f4a-26c6-4e1b-b6fd-31274773235a/kurt_vonnegut_slaughterhouse_five_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e471f39f-ffd1-4f32-883c-9b9b73bf642e/winegoxujevijixovomuru.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_off0000f2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DB 5300 bytes
SHA-256: cefb2d90eff2d8f62552be61607e894840d2dec4ca1d39ce2b0eb393ed810f70
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 10548 bytes
SHA-256: 96afb897b07b93082d17655fca08fc890709b64c5ffede898ac55c1517d2fc16