Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcda5cc7ee8af795…

MALICIOUS

PDF

70.2 KB Created: 2021-02-21 08:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 28e886db36f2ea3ff2b1707fd2923826 SHA-1: 7e3c3d44be28a77ef6d2e9e2cc6a855e14bbe71c SHA-256: bcda5cc7ee8af795574ff4fefeb109f58866a419208c1bebf8f6f12b5a226d29
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of hosting many links on disposable domains, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=weather+worksheets+for+kindergarten PDF link annotation
    • http://busforpay.online/13848946965j0919.pdfIn PDF document text
    • http://kupivse.xyz/graphic_design_training_in_suratkl3ke.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/B2GWWgi/nomap.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/hcTjdhg/relaxing_spa_music_with_water_free_mp3_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411681/normal_5fc738508b370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_600a1154436e1.pdfIn PDF document text
    • http://devgm.design/20140222179i77vg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_602d4ba32edbe.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/ibY5ieL/waze_traffic_app_for_iphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lizonidomada.rf.gd/49569554090.pdfIn PDF document text
    • http://kejoluxukoso.rf.gd/66_laws_of_success.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/christmas_carols_for_choir.pdfIn PDF document text
    • http://wirirarosutuki.epizy.com/scaled_bar_graph_worksheets_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/40th_bcs_preliminary_result_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/91262771587.pdfIn PDF document text
    • http://wofufudemito.epizy.com/home_loan_repayment_calculator_excel_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/79670584624.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_off0000d586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD586 5304 bytes
SHA-256: c81978289b96277dc4c4a6ddefd0a6157437a6106ec71a8737fcb5d6f1030a46
font_01_sfnt_off0000e7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AB 10552 bytes
SHA-256: 5fb461df4b95d3b6ba3901b0d042e5d6f4a9c29a8c9edadc59531fbea433b3c4

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