Malicious PDF — malware analysis report

Static analysis result for SHA-256 66da31dc5c106212…

MALICIOUS

PDF

74.0 KB Created: 2021-04-21 12:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 298ba36ea23fc185fda56c88ad7c1005 SHA-1: ee402f8397772642603a27b0eb57d10685d85f2b SHA-256: 66da31dc5c106212b83b3dd30c7b96e828165027750cadf6900695f366e367a1
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that points to a suspicious domain, identified by heuristics as an external URI and an embedded URL. ClamAV detection and ML classification strongly indicate maliciousness, classifying it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, appears to be a lure related to 'Matlab function handle'. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://jumiwimov.ru/strik?utm_term=matlab+function+handle+2+outputs
    • https://radalumimobexod.weebly.com/uploads/1/3/5/9/135957078/goravejepupi.pdf
    • http://ueuniti.xyz/fraction_division_word_problems_6th_grade9tvfl.pdf
    • https://cdn-cms.f-static.net/uploads/4416796/normal_6066a54417885.pdf
    • https://ruzutemeba.weebly.com/uploads/1/3/2/6/132681300/mexen_mapawimala_zewefi_gojesusuwo.pdf
    • http://pek-24.cc/nj_drivers_license_not_for_real_idryraj.pdf
    • https://static.s123-cdn-static.com/uploads/4403681/normal_5fc93d1a9fc52.pdf
    • http://arendagg.xyz/54621399691luaht.pdf
    • http://tomandbxof.site/dufipifotolj0ixz.pdf
    • https://static.s123-cdn-static.com/uploads/4416140/normal_5ff0a5f576213.pdf
    • https://letosuve.weebly.com/uploads/1/3/0/7/130739520/4281865.pdf
    • http://jimemiwubir.iblogger.org/african_alleluia_satb.pdf
    • http://bapebofefo.22web.org/29151955579.pdf
    • https://cdn-cms.f-static.net/uploads/4404990/normal_606e923653c1b.pdf
    • http://phtech.site/where_to_buy_gravity_falls_journal_3_special_editionn4bc8.pdf
    • https://cdn-cms.f-static.net/uploads/4474750/normal_606ddeee6b322.pdf
    • https://jazawimap.weebly.com/uploads/1/3/5/3/135346256/4102393.pdf
    • http://hisgohar.site/66214869138yg35a.pdf
    • http://bcpzonasegura10beta-viabcp.com/702736469807rnuy.pdf
    • https://sovufejado.weebly.com/uploads/1/3/0/7/130740048/vopadurobos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sufazomewugexu.epizy.com/venokijopidoguv.pdf
    • http://xoroxisefofeba.epizy.com/19596117421.pdf
    • http://xezakuwedujit.rf.gd/aditya_hrudayam_stotram_download.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01a.bin
680d227ea9d14e6ae46daa629aeb83e59595a16aa799ed1a238ead3e6d63e0dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 5424 bytes
font_01_sfnt_off0000f298.bin
37e50fd5b060435cbd1041e5b3dab82df01c636ecb12a328c2f6457b71c70d82
pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 11644 bytes