Malicious PDF — malware analysis report

Static analysis result for SHA-256 26edc2c2a1807864…

MALICIOUS

PDF

74.5 KB Created: 2021-03-18 05:17:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0eb4b285e2e46f43a3f8cd9b07cd9c62 SHA-1: 44f409746863891aba6c9b70ee8ce778f4b90ef1 SHA-256: 26edc2c2a1807864cfeccdef2b423564b4d097ca4584991074e7cb42beef3d42
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely leveraging embedded JavaScript for redirection or exploitation.

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://fokemale.ru/strik?utm_term=weber+bbq+cooking+recipes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480585/normal_5fe31b8f67f6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450876/normal_5ff0d21d26e88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366660/normal_5ff690fee5481.pdfIn PDF document text
    • http://znakomstva69.space/sudakoftder.pdfIn PDF document text
    • http://micrometer25bill.site/anthony_giddens_sociology_freeljbjk.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/Hihif5C/cut_and_paint_mod_apk_download_android_1.pdfIn PDF document text
    • http://nazhivy.net/dajidbfxqr.pdfIn PDF document text
    • https://cdn.sqhk.co/womafafowix/Qqhcjgx/jokufuxabe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384152/normal_6044bb7015b4e.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/jahagjo/archery_3d_ranges_near_me.pdfIn PDF document text
    • http://leoidet.xyz/somewhere_over_the_rainbow_piano_chords_in_crzhvo.pdfIn PDF document text
    • https://cdn.sqhk.co/dujuxafetot/SyidXwZ/82809162410.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/86284668577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411714/normal_601ca41b0eba8.pdfIn PDF document text
    • https://cdn.sqhk.co/zisuzunon/QCOxmgi/symmetrical_and_asymmetrical_balance_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/jdWOHia/59625202687.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wudemexa.myartsonline.com/literary_theory_an_anthology_julie_rivkin.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_off0000e688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE688 5204 bytes
SHA-256: 23eb6260f031c624cc1e7c964d3f242743affb70fa3c9ffe0acc80ac271548ae
font_01_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 11128 bytes
SHA-256: 0a9e80d62c3d463be4083267e66d17b5f79457334acb4630183c2fd37d898740

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