Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde0dd414f29e9ad…

MALICIOUS

PDF

76.3 KB Created: 2021-05-11 11:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 068d0c509159b0f747f40468f0d84440 SHA-1: ac7838aa4711960c652833a536bc6be2e2e0d027 SHA-256: fde0dd414f29e9addf0fc3ba3e12e24c6f4d632a6d73cd8d8a4e1ee100aff282
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to direct users to phishing or malware-hosting sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing lure designed to exploit user curiosity about medical topics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://botokaw.ru/wb?keyword=what%20is%20moca%20test%20for%20dementia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366623/normal_60414f83588a8.pdfIn PDF document text
    • http://zivetizigomiki.iblogger.org/bluetooth_software_for_desktop_computer_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480584/normal_5ffb686de9608.pdfIn PDF document text
    • http://rotawafuwuno.scienceontheweb.net/surrealismo_storia_dell_arte.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5fe803cd92dc7.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/71048932737.pdfIn PDF document text
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/9703410.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/gujedalobezuxos.pdfIn PDF document text
    • https://nanewibogexuro.weebly.com/uploads/1/3/1/3/131382113/jizikejanaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lixevenenofu.epizy.com/alternator_working_principle_in_tamil.pdfIn PDF document text
    • http://kapifotezuxevup.epizy.com/numeguzezolili.pdfIn PDF document text
    • http://witosef.rf.gd/19972155428.pdfIn PDF document text
    • http://wumiwumo.rf.gd/what_are_tools_of_grounded_theory_in_qualitative_research.pdfIn PDF document text
    • http://luxupuxud.myartsonline.com/58108703117.pdfIn PDF document text
    • http://sabaxop.epizy.com/getaxarakuturilejerogo.pdfIn PDF document text
    • http://taxowojo.epizy.com/rinetupujopurigilar.pdfIn PDF document text
    • http://murapimopavopa.myartsonline.com/economic_botany_textbook.pdfIn PDF document text
    • http://tikawemukotuwaw.rf.gd/what_remote_app_works_with_element_tv.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_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 5244 bytes
SHA-256: 8727a830943338a96cba5129364ce215e1d618cc6053240172dfdb3ae129467e
font_01_sfnt_off0000fdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 10948 bytes
SHA-256: 0217f9b414d644da7d3b558e30d0d5d63701c526c930d4980723b70b6822341c

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