Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e39836aa7bf6921…

MALICIOUS

PDF

82.4 KB Created: 2021-03-30 20:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d87d59f50a904229ee41515b8169bfd SHA-1: 22fa1fce80fda818fc683678e205f12027aba5cf SHA-256: 4e39836aa7bf69214d557da3c9ef36038130ecaff37d36ad42a48f1a8b2b1cd7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many of which are part of a link farm, suggesting an attempt to direct users to malicious websites. The primary malicious URL identified is https://vilenefex.ru/123?utm_term=conversion+of+pdf+file+to+excel+sheet, which is likely used to host or redirect to malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/123?utm_term=conversion+of+pdf+file+to+excel+sheet
    • https://vukibipodut.weebly.com/uploads/1/3/4/6/134690361/c54626a.pdf
    • http://nifazafagikoxa.medianewsonline.com/farmers_insurance_logo.pdf
    • https://cdn-cms.f-static.net/uploads/4481539/normal_6051e94847269.pdf
    • https://static.s123-cdn-static.com/uploads/4378613/normal_5ffa39e125fc1.pdf
    • https://cdn-cms.f-static.net/uploads/4448332/normal_602eea6396e39.pdf
    • https://rebanurox.weebly.com/uploads/1/3/4/4/134490941/kemoxefuxa.pdf
    • https://kodidorimo.weebly.com/uploads/1/3/1/3/131380292/vemus-jakixemi.pdf
    • https://linugotozoluj.weebly.com/uploads/1/3/4/6/134662393/xigoka.pdf
    • https://cdn-cms.f-static.net/uploads/4473445/normal_601fdbdb9fd60.pdf
    • http://mixutadumekaje.mypressonline.com/vukitatogekowanor.pdf
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/8928225.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://siniligavaxuvul.onlinewebshop.net/83830586946.pdf
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_de6e49ca8dc140c38edfc629a8cf5375.pdf?index=true
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_0549e9bc4bbe406094aba3ce89b6073a.pdf?index=true
    • http://jekidosokun.epizy.com/badopugegabuvojazeni.pdf
    • http://sotewupuwen.epizy.com/fewigenaredewuxeguxavil.pdf
    • https://uploads.strikinglycdn.com/files/9250cec2-a574-40f7-8b32-82746e166d62/julolo.pdf
    • http://bexovivuvere.myartsonline.com/nesaj.pdf
    • https://uploads.strikinglycdn.com/files/c27a2d37-4f0e-4a6d-bb17-eccf343c8bdb/the_motorcycle_diaries_screenplay.pdf
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_e7bd58845c2e40d9b53f9f34dca07350.pdf?index=true
    • http://nozezuwaxufudeb.epizy.com/fuwixezilubagupetajafuv.pdf
    • https://uploads.strikinglycdn.com/files/eb7dfed0-61f2-43a9-b7e4-1348bf570cbd/rotel_rsx-1550_service_manual.pdf
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_e29f90945bfc4d9e8aca7efe6e862977.pdf?index=true
    • http://wodasakuzetu.rf.gd/59388984831.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a0.bin
d3ccfb39f43f77285abf44dce24d8a1b6bc6b44561d8f01c9f713ea849196a11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 5064 bytes
font_01_sfnt_off000102e1.bin
f334e08c829ce2c623117c5c6412433842854266b1eefebe55ee307e36415ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E1 10568 bytes
font_02_sfnt_off00012711.bin
f283a563ee48c68d0f210b91d059b93f2da97875a4894e08c15e1f8ed5b97a7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12711 16076 bytes

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