Malicious PDF — malware analysis report

Static analysis result for SHA-256 2517515b9ff23f27…

MALICIOUS

PDF

76.8 KB Created: 2021-04-17 07:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d51d1ce92c690de4ad9f33ba4c137922 SHA-1: 242b156bf7bfccdb6d01a4a38b562937772eb82d SHA-256: 2517515b9ff23f27a6a8a786ad524d664038f91fb27008580c43afc884b27cfc
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 link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'Google search with image api' and 'wkhtmltopdf', suggesting a lure to a fake search result page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=google+search+with+image+api PDF link annotation
    • http://sellamorem.com/xugobelepilasapixesafizi436.pdfIn PDF document text
    • https://cdn.sqhk.co/zozijawutuxu/hdigMgc/filing_a_false_police_report_misdemeanor.pdfIn PDF document text
    • http://file-id.ru/goldmark_report_nursing_historyyjoao.pdfIn PDF document text
    • http://zomoxoxuriw.mypressonline.com/figovowifudag.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/iijgsia/spider_solitaire_rules_2_suits.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/B8hhafU/mepidiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491688/normal_602617d1164d5.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/voltage_regulator_theory.pdfIn PDF document text
    • http://instapriz.site/61437985276fhu1n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5fcd80ff3d9ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386613/normal_605b5a55c7255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453118/normal_605cedb099a10.pdfIn PDF document text
    • http://noxaduva.mypressonline.com/70659735123.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/mai_teri_chunariya_lehrayi_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/65218904256.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_c59d2809f0ae41399dbfcf99de76d22d.pdf?index=trueIn PDF document text
    • http://pimobepetokonud.myartsonline.com/55320173405.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/finutonujogowoxiz.pdfIn PDF document text
    • https://3789e5f8-265e-48cd-8836-241a044b7ceb.filesusr.com/ugd/45ef7e_c50a4f648c4a4b8881eb86883875c92e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nojemi/axis_mutual_fund_sip_performance.pdfIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_e63ce492d8874a44b73d97d46bb6e234.pdf?index=trueIn 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_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 5472 bytes
SHA-256: 72ac5c57328484bcb26f96724269d7e2d02bbbdbb9d550c3be38791b9f6c9e34
font_01_sfnt_off0000ffd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 11132 bytes
SHA-256: a8c23ee2d1d926b18909827995abc85e98ee1976e67a233ff47fce872482aaec

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