Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e83673d805b6d51…

MALICIOUS

PDF

79.2 KB Created: 2021-03-10 09:06:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 67d90173cc537700e12ac90a65f97561 SHA-1: 939c3ba23616d92f7cfe90575e41407c7605e71b SHA-256: 5e83673d805b6d51f4e51841b18b26e71835346eceeb9437510d88fa8c92d8bf
134 Risk Score

Malware Insights

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

The PDF file contains numerous links to disposable domains, many of which host PDF files, suggesting a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=dyson+vacuum+dc41+parts PDF link annotation
    • http://copyrightmediahelp.com/nuragiviguzejipancexd.pdfIn PDF document text
    • http://decideyouself.fun/already_beyonce_and_shatta_waleyq38u.pdfIn PDF document text
    • http://muwabiva.iblogger.org/6489703623.pdfIn PDF document text
    • http://ziwavabewite.66ghz.com/subipoxemilese.pdfIn PDF document text
    • http://indital.fun/how_to_summarize_a_chapter_examplegefp9.pdfIn PDF document text
    • http://wssummer.space/mantra_pushpam_in_telugu7rihd.pdfIn PDF document text
    • http://1s.london/44356639718nxckk.pdfIn PDF document text
    • http://budijam.iblogger.org/zuxig.pdfIn PDF document text
    • http://newser.site/fuxesovijirutimesipoz979ep.pdfIn PDF document text
    • http://tublitalia.fun/how_is_organic_chemistry_used_in_everyday_lifenu4bb.pdfIn PDF document text
    • http://fapenas.22web.org/sample_of_environmental_management_plan_report.pdfIn PDF document text
    • http://lidzadva.xyz/64359187584c0rgu.pdfIn PDF document text
    • http://dasegirovitomen.22web.org/53192219946.pdfIn PDF document text
    • http://nefritthebestthing.site/11229037243nyeqt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafekebokidodat.rf.gd/english_grammar_basic_book.pdfIn PDF document text
    • http://gipunixufekuto.epizy.com/what_is_more_accurate_a_food_chain_or_food_web.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08cc4649-e3ec-497d-9565-d84dab344aed/lukigurufif.pdfIn PDF document text
    • http://jelelonu.rf.gd/seaswirl_boat_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf11f98d-77f0-498d-a7ef-3b96b7b25506/weight_lifting_program.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_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 5488 bytes
SHA-256: 68181ebfe2c08eee2f53dbfccae4663da997ccfb729be4b0b14279b490e81289
font_01_sfnt_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 10752 bytes
SHA-256: 366cbf9ed0c4e54a7a6bdab22e20e0ad6e0402ac15fa23a80fb695875b0faf47

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