Malicious PDF — malware analysis report

Static analysis result for SHA-256 5487e0eb63d2a185…

MALICIOUS

PDF

121.1 KB Created: 2021-03-18 04:51:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cc24a3f413418dda84f306ae62e53e9 SHA-1: d38565cd949a65b274e038510b0c3fdc425766f4 SHA-256: 5487e0eb63d2a185bcfa70c951f83c73b61fd8bd2e86090607383c9efb95db48
156 Risk Score

Malware Insights

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

This PDF file is classified as malicious due to multiple heuristic firings, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, and a ClamAV detection. The document body, though heavily obfuscated, suggests a lure related to 'dead sea scrolls books pdf', directing users to external URLs. The presence of numerous external links, many of which are unknown or potentially malicious, indicates a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=dead+sea+scrolls+books+pdf
    • http://leadtop.co/bujukozewopufezebugodetownwy9.pdf
    • https://fileduwefevara.weebly.com/uploads/1/3/4/3/134384607/lebewevowemipaj.pdf
    • https://bojowavezuzabi.weebly.com/uploads/1/3/1/3/131382797/lurabosidijutup.pdf
    • http://clebohets.xyz/maplestory_error_code_40nmyul.pdf
    • http://creditscorehelp.info/63647093420dzm72.pdf
    • https://cdn-cms.f-static.net/uploads/4365628/normal_60307b8ba39db.pdf
    • https://wivetagimogik.weebly.com/uploads/1/3/4/6/134618772/puzolo.pdf
    • https://cdn-cms.f-static.net/uploads/4426075/normal_601d125ec563b.pdf
    • https://cdn-cms.f-static.net/uploads/4462678/normal_601b3be2372b8.pdf
    • https://cdn-cms.f-static.net/uploads/4448550/normal_604630e566134.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_f7485b9383be493fb0f2b91ab0312e49.pdf?index=true
    • https://s3.amazonaws.com/sixolose/how_to_export_garageband_songs_from_iphone.pdf
    • https://s3.amazonaws.com/rodiligarexo/math_problems_with_answers_and_explanations.pdf
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_227c5ceeac5b40d28f8fbf396c985795.pdf?index=true
    • http://livufuxe.epizy.com/vegikanisajadab.pdf
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_e98ddf46053d4a1195b72fafef2a09ff.pdf?index=true
    • https://s3.amazonaws.com/fibesezati/biblia_reina_valera_1960_gratis_para_leer_gratis_en_espaol.pdf
    • http://vukanaxugosazed.rf.gd/epispadias_definicion.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019d48.bin
f53e540131504314f63a82878d39e1b7cd2a8680c3ffd5f01eeb8984feb791e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19D48 5352 bytes
font_01_sfnt_off0001af8d.bin
2ee9af24feebeb618ad5f785cc1c72b05de72c0ece3fde09e1a6693319fa97f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF8D 11572 bytes

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