Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83b8fc39699066b…

MALICIOUS

PDF

76.5 KB Created: 2021-04-08 06:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faa9fa84ba3e4d94b2eff73389b5ca9a SHA-1: 999570b2e0577f82ce607144ef8c2f41f8839378 SHA-256: e83b8fc39699066bec2bc5f610641993e65b2fd945782d330120303e61422ace
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is also detected by ClamAV as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to periodic table elements, directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://crophysi.ru/strik?utm_term=what+elements+on+the+periodic+table+are+inner+transition+metals
    • https://faloxumotib.weebly.com/uploads/1/3/4/6/134646793/jefajuvafopogovinud.pdf
    • https://cdn.sqhk.co/ruwonumatag/hhbgijg/dome_of_doom_game_mod_apk_download.pdf
    • https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/3cbfaeb7f5e124.pdf
    • http://trynon.xyz/gixezosev9g9p.pdf
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/8701419.pdf
    • https://penuwepilaxol.weebly.com/uploads/1/3/4/7/134756509/4854561.pdf
    • https://cdn.sqhk.co/zobazulibes/eHhjjfG/phage_display_library_construction_and_screening.pdf
    • https://jazigibebegada.weebly.com/uploads/1/3/1/6/131606339/d6f0976fc835e30.pdf
    • https://sitepofom.weebly.com/uploads/1/3/1/4/131438718/5494585.pdf
    • https://nefirekemoziwep.weebly.com/uploads/1/3/4/3/134332842/8939380.pdf
    • http://geleostone.online/93060628442w70rz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_cff87dc5388d43438f9fa5e90481c7e0.pdf?index=true
    • https://s3.amazonaws.com/neporezofov/26974810580.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/focus_group_discussion_interview_guide.pdf
    • https://beb587af-1766-4a1c-893d-8c04a9882fa7.filesusr.com/ugd/f3bec4_bf39197492dd4353b1bbdc5088b70530.pdf?index=true
    • 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_off0000ea64.bin
0a6a1747ec262cc5fe7b96f16ee50096524405af8d52ed83be626ae2126451df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 5468 bytes
font_01_sfnt_off0000fcd2.bin
b3909bdaebe72e7e7a9e4570d1ff4d63d6edcdf45dd85bbd5f5f7d3a9cd3239b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 11208 bytes

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