Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ddcf458e3b4abcb…

MALICIOUS

PDF

95.3 KB Created: 2021-03-01 19:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9c62628fa490a7c1d8cb3b5f84465195 SHA-1: 73fd8ad6c80b1179ec4923d9dd2442497dc17865 SHA-256: 0ddcf458e3b4abcb2b810bae2b5117e6bf76d7f1a81f0191b6efef39fe2d4dc6
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The presence of the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF is designed to redirect users to various external sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection profile strongly suggest the PDF is designed to lead users to malicious content.

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://zajinet.ru/wb?keyword=super%20mario%20bros%202%203ds%20world%201%20castle%20star%20coins PDF link annotation
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/44084a886f546d.pdfIn PDF document text
    • https://wilixutisew.weebly.com/uploads/1/3/4/0/134095986/waniwowutosol-jarabutatujun-ruzodaperija-pufixexadelem.pdfIn PDF document text
    • https://numuzobiw.weebly.com/uploads/1/3/4/5/134589566/1896404.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484632/normal_60000fe7a26ea.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/tjidicL/49108567617.pdfIn PDF document text
    • https://cdn.sqhk.co/mifopanikil/jdjcKDN/17238190912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_600a576b9c890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421468/normal_5fdbd356e650b.pdfIn PDF document text
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/xiboranemo_minabupox_zevejar.pdfIn PDF document text
    • http://vorecan.fun/54456913046t1vqy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368501/normal_5feedf0583711.pdfIn PDF document text
    • http://ens-pictures.ru/coreldraw_old_version29oo6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzuzefu.rf.gd/13937032613.pdfIn PDF document text
    • http://zaxutakizet.epizy.com/brc_confidential_reporting_system_procedure.pdfIn PDF document text
    • http://sokevigaku.rf.gd/95056901999.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_off00013426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13426 5900 bytes
SHA-256: 0882fc6cd6240e3c36ac4b7a455490169382d472cfb3e0593679840be4b950e1
font_01_sfnt_off0001482f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1482F 11828 bytes
SHA-256: 61f8d2e5d11107b5829e2691cb5811e22d4d8763819cc7323ad54a21497bc6ed

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