Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7482957d9600174…

MALICIOUS

PDF

81.2 KB Created: 2021-03-12 03:00:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b78c505eac1ca82810268b232004789b SHA-1: 28ad1e7d3e03adcba33c3a6699ab38f37eec10e3 SHA-256: a7482957d960017458ae1998ef0dbaefcb25efa5c608201180f2f9c8a44a4ca0
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant heuristic indicating it functions as a link farm hosted on disposable domains. One prominent URL, https://mezovuduw.ru/strik, is flagged as suspicious and likely leads to a malicious resource. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://mezovuduw.ru/strik?utm_term=basic+power+electronics+micro+projects PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386834/normal_5fc56b60d78a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_601a05505c421.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405208/normal_60087d588e9d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466166/normal_601013d4dfa4e.pdfIn PDF document text
    • http://nujijaj.getenjoyment.net/subugitoro.pdfIn PDF document text
    • http://cashbackk.site/tapoguwuvosokefesq4u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_5fdc371a77f7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_603331a570c94.pdfIn PDF document text
    • http://idealica-ordina.site/26560499645vsmaf.pdfIn PDF document text
    • http://ragofilud.medianewsonline.com/13813252631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_5fd7a5c6174e1.pdfIn PDF document text
    • http://myfoxing.online/eurofins_aptitude_questionskqft5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dusameferadulo.onlinewebshop.net/editing_a_file_in_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebe4fa10-ee08-49d9-82bb-d991111faa74/64170475863.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/chhota_bheem_video_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/20051680363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed3c3d2b-f35c-44ec-b8cd-bbc2fc96b584/voleledofamizusozop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80cf0da7-8c99-47f1-90e9-5ddc911c2a84/the_cellist_of_sarajevo_part_3_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/safety_data_sheets_for_paint.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/cuales_son_los_tipos_de_archivos.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_off0000ffef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEF 5296 bytes
SHA-256: 0011885c7e04fb78f0dfcc3d58cbd28caf533476cb4c17c0acd3cc37b86d4518
font_01_sfnt_off000111ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EA 10848 bytes
SHA-256: 16b0c2ff6f1712d0c29a8154ab7b6ae89d0f71d50c48092fdc28b1c8c16b7c81

Open this report in the interactive analyzer, or submit your own file for analysis.