Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2df3680b395273c…

MALICIOUS

PDF

74.6 KB Created: 2021-02-25 20:09:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0b92dd83153358a1b0c0da95ac233f50 SHA-1: 142983bb3ccdecf665a222837d62de300c853f5a SHA-256: a2df3680b395273cfd0a4641c42373d54e349bde4527cc7018386a45d0b1f35a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The presence of external URIs and the 'link farm' heuristic strongly indicate the document's purpose is to redirect users to malicious sites.

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://baarspo.ru/aws?utm_term=how+to+restore+a+smoke+alarm PDF link annotation
    • https://cdn.sqhk.co/jarebomu/gfgdvjj/rojimupazuti.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/oracle_sql_multiple_rows_to_comma_separated_column.pdfIn PDF document text
    • http://evromotors.net/429909691384bgmf.pdfIn PDF document text
    • http://1xbet-regi.site/actualizar_marcadores_chrome_androidy0had.pdfIn PDF document text
    • http://13millions-warzone.store/94963741688svewf.pdfIn PDF document text
    • http://leqqurint.online/wimimenujopexado12wux.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/cHqRZoN/free_websites_to_download_music_videos.pdfIn PDF document text
    • http://begdas.fun/83603097509nw8th.pdfIn PDF document text
    • http://datingdate.site/34170469910aelou.pdfIn PDF document text
    • http://werenntaq.online/xanemeboluv6u6.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/figukelanajod.pdfIn PDF document text
    • http://moviesaddaa.online/ipcc_report_october_2018_summaryj6maj.pdfIn PDF document text
    • http://rokamik.iblogger.org/minopek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/sirunula.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_off0000e7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 4948 bytes
SHA-256: 50af40b89129c3dd6dd1118d196921c4f3d3734e8c8197d4621b2e77b87de633
font_01_sfnt_off0000f895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF895 10968 bytes
SHA-256: f9146d780effbec9221bbf41840a9581167c20bdc863ba544df4198e0988558a

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