Malicious PDF — malware analysis report

Static analysis result for SHA-256 853cacd161aab1cd…

MALICIOUS

PDF

75.7 KB Created: 2021-04-08 16:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 3c6df98b95dbe56e26917445e08f73f5 SHA-1: 818a35e6ad07c45fc79de951106ae5afc38d7de2 SHA-256: 853cacd161aab1cddb28a807667ac8e6fdf0bb2f4b3754f8f94df74aa4f30912
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM confirm the nature of the attack.

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://dugedepap.ru/strik?utm_term=mf+35+starter+motor PDF link annotation
    • http://1xbet-football.fun/294931057364p93d.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/3472029.pdfIn PDF document text
    • http://copyright-help-center.com/michael_jackson_scream_jumper8slr7.pdfIn PDF document text
    • http://sosed.market/kigedepupituvevezynznu.pdfIn PDF document text
    • https://bugitepekasi.weebly.com/uploads/1/3/4/6/134669175/bizifiwozaja_dujasotut_kexubovugojokoz.pdfIn PDF document text
    • https://topulatemavi.weebly.com/uploads/1/3/4/3/134367493/xowinorojofugip_miwimepesabe_ruragijawevi_nabavimemo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_6063b35b3aca2.pdfIn PDF document text
    • http://promoocaoameericanas.com/avg_tuneup_mac2e0z4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464739/normal_5fd9e04aa8af0.pdfIn PDF document text
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/9013114.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/5e633613-be38-4ae3-be3c-be8effb5c9bd/washington_dc_dulles_airport_hotel_shuttle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe5069e-f043-4546-bf87-d9233cadf3c6/el_alquimista_audiolibro_descargar_gratis.pdfIn PDF document text
    • http://tutalisog.rf.gd/79109130466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/005be1aa-4504-4c96-9044-13999367a24a/how_to_use_a_presto_23_quart_pressure_canner.pdfIn PDF document text
    • http://titegerekarirov.rf.gd/76670292249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/654bfb3a-6d80-4991-9c7a-72ccda291dbd/25376001901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3585954a-e831-40c2-a538-fd17e0daa2e8/1365446994.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_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 5172 bytes
SHA-256: c2ff3335492f532f0d81f0178ba555ce61fb79c8da2c553b08d192c82f017e44
font_01_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 10864 bytes
SHA-256: 948ead70864fb34e61c90c7186bcb2de140e8be91a28d078613ec00d83ac0f53

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