Malicious PDF — malware analysis report

Static analysis result for SHA-256 088e2face97fe42a…

MALICIOUS

PDF

79.3 KB Created: 2021-06-03 11:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a91f53813fb16dffa0f4080fb7abcf1f SHA-1: 612ef972bb3199c072900c23acc54e56f175e87b SHA-256: 088e2face97fe42a2f09d8e5842a3ee51ae4dbd3738023c26e09aa77ebf6d434
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with a primary suspicious URL being https://coretry.ru/pbw?utm_term=define+aural+rehabilitation. The document's structure and the presence of many external links suggest it is designed to redirect users to potentially harmful websites, likely for phishing or to distribute further malware.

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://coretry.ru/pbw?utm_term=define+aural+rehabilitation PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385612/normal_5fecc40de1da7.pdfIn PDF document text
    • https://ridulimozujigo.weebly.com/uploads/1/3/4/1/134109280/3d310c4d62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365570/normal_5ff57bb2da63f.pdfIn PDF document text
    • https://jisevudes.weebly.com/uploads/1/3/4/8/134882916/petawi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480423/normal_606b084f3d0da.pdfIn PDF document text
    • https://mikuloxituxawe.weebly.com/uploads/1/3/1/4/131410747/4714569.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486566/normal_5fcf4fdbef04c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/83462ade-064c-487e-9e53-60e3a547041c/mizagatiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a62adf8a-15dc-4351-9e43-e94fd3605a6e/what_ink_does_epson_2850_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14f99701-cb67-4511-9972-ca5a8daecdcf/how_to_factory_reset_motorola_sbg6580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9711bdf3-3ad5-4a41-a5b0-216417bdcc5a/does_target_sell_g_shock_watches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cebab11-bf59-45b2-adcf-18d4e829424a/mechanical_drawing_tutorial.pdfIn PDF document text
    • http://xizisimavi.pbworks.com/w/file/fetch/144540819/4904252770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a21616-c36f-4967-ad03-9e6d6842951c/fundamentos_algebra_lineal_larson.pdfIn PDF document text
    • http://tekitejug.pbworks.com/w/file/fetch/144531657/ingenuity_smartsize_gliding_swing_and_rocker_assembly.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144439470/67801589109.pdfIn PDF document text
    • http://jebusolole.pbworks.com/f/16581376891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5534596-6327-4c6b-ba7c-a5425266d7be/walmart_black_friday_sale_days_2020.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/f/arc_length_area_of_sector_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eff3b80-e943-477d-b736-3c1c11cedaf3/rurodatemu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 4696 bytes
SHA-256: 54f9e9c43982fe32ac45832c3d09ba19e2135cf752f5c1c7a0ec5f5dd94f3716
font_01_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 10464 bytes
SHA-256: 7119c0e6d7b6f3297815bd4bf864e04e70e4299edf49b5ad5167487f52f1b132
font_02_sfnt_off000120b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B6 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71