Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd922adf30fb81c…

MALICIOUS

PDF

76.7 KB Created: 2021-03-13 18:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 00466713026438f1793b5908ab5e1504 SHA-1: b4d5675d8655023643ec5024848ac0c60f4000a8 SHA-256: cfd922adf30fb81c7ad37375ed25df16263e49e901fa83ddf7673cca27e0e63f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful 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://soxebez.ru/strik?utm_term=ikea+malm+high+bed+frame+2+storage+boxes PDF link annotation
    • https://lovivusopeme.weebly.com/uploads/1/3/6/0/136095788/wexisisumi-lojujefa-kazonu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_6049998867a08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471719/normal_5fefde68225bd.pdfIn PDF document text
    • http://stassikorskyi.com/rifts_dinosaur_swampxe3gp.pdfIn PDF document text
    • http://jusapp.club/what_is_the_netflix_series_about_serial_killersx7jax.pdfIn PDF document text
    • https://salobomuxalevi.weebly.com/uploads/1/3/1/0/131070078/2a418d33bdc9.pdfIn PDF document text
    • https://cdn.sqhk.co/porekige/fPijdie/kexidunemotonawavef.pdfIn PDF document text
    • https://cdn.sqhk.co/lotazoza/8Uhd2hi/waxapivigukuwija.pdfIn PDF document text
    • http://tamakedesununod.mywebcommunity.org/84055920715.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/wgex4ic/como_pagar_mi_factura_at_t_en_linea.pdfIn PDF document text
    • http://deemonatrafik.xyz/911673577f4v07.pdfIn PDF document text
    • https://pasadotofeb.weebly.com/uploads/1/3/1/4/131482919/zakupariminaba.pdfIn PDF document text
    • https://cdn.sqhk.co/nidaruzada/eihGigI/dr_john_kong_dds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_602f5049ade4d.pdfIn PDF document text
    • http://ponemofetu.scienceontheweb.net/dns_323_firmware_1.09_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_ea289d15d4dd4c5bb7487ace9a55f3fd.pdf?index=trueIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_3659feaf5069498985d6fce683c1ac21.pdf?index=trueIn PDF document text
    • http://zitasixan.atwebpages.com/guvutepuwupolosumo.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_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 5660 bytes
SHA-256: ac0f8cf8489d9f77788468a971b4e61c7a3e1d31e4705d3532df7f9d020e1231
font_01_sfnt_off000100bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 10796 bytes
SHA-256: b77a87a3118aabe75224f8eea8638d198ffbbc119f8dc0a6d4a38f4d294acdf5

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