Malicious PDF — malware analysis report

Static analysis result for SHA-256 086e38b86a34966c…

MALICIOUS

PDF

81.9 KB Created: 2021-04-05 10:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d9c6b57700bc4ef4033429b7ecfd3e8c SHA-1: 56a7a4c1493ea17d8c8ac34fdfaceeff0da12e01 SHA-256: 086e38b86a34966c25022dcf172a0f7a6be08226c49335b717298e48f3203395
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One prominent URL, 'https://resalured.ru/strik?utm_term=how+do+i+use+my+cuisinart+convection+bread+maker', is likely part of this scheme. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://resalured.ru/strik?utm_term=how+do+i+use+my+cuisinart+convection+bread+maker PDF link annotation
    • http://viputixezererej.66ghz.com/fisovonopamu.pdfIn PDF document text
    • http://mosilewuzofivan.iblogger.org/11788348236.pdfIn PDF document text
    • http://noxiliko.iblogger.org/batexabegakovonexefijaja.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/leverage_ratio_basel_iii.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_1e7694a0ee774717844227a1670a299b.pdf?index=trueIn PDF document text
    • http://niwemepog.epizy.com/31401804826.pdfIn PDF document text
    • https://681956c7-2c57-495f-b996-d04b50c745b0.filesusr.com/ugd/907d98_e80004c505d84efcae66157c8df4cc7a.pdf?index=trueIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_aba2f7f782c248e0b5771feec2a4af87.pdf?index=trueIn PDF document text
    • http://merekum.rf.gd/77464158778.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_834c53dc7a744262ae6cbc0029d8a2d2.pdf?index=trueIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_9f79037407cf45bbac76313a910d4b91.pdf?index=trueIn PDF document text
    • http://pobuwejugu.epizy.com/resume_templates_for_microsoft_word_2013.pdfIn PDF document text
    • http://movasedumanepe.onlinewebshop.net/poxotinebanetumuvosumak.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_938a277c7ed9469081fd2e90a71feb27.pdf?index=trueIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_a773f912b66c4bb9afcdf4305c225baf.pdf?index=trueIn PDF document text
    • http://bugenerefajujus.atwebpages.com/microstrip_antenna_book.pdfIn PDF document text
    • http://giwokekurodi.rf.gd/zodewij.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/35315580314.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/accuair_e_level_plus_touchpad.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/40720544298.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/application_format_for_principal_of_college.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/50312972137.pdfIn PDF document text
    • https://e5aadbcf-511f-4ee2-989a-4410a22eeed0.filesusr.com/ugd/64930c_725c67dbef1f4ac2b3c7934b8dafdec2.pdf?index=trueIn 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_off000103b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 5472 bytes
SHA-256: f699ca1434844a8640a65870a36fd5a6df8ce7719bc877d72f35455f58cd7e1b
font_01_sfnt_off00011655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11655 10420 bytes
SHA-256: 138acefedf7deaebe155ba69c28473b3a41c810066a43ce758ea4b3e56732209