Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecacd434608df892…

MALICIOUS

PDF

78.6 KB Created: 2021-03-24 06:40:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e8cfff71d1c8fa760d3877a7fd34ec25 SHA-1: 219765291221822eac15d1900655e9fb9d8ba51c SHA-256: ecacd434608df8921f2fb9abbec127137734e17a3e14e0e2fb6b079c420c1605
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to manipulate search engine results or redirect users to malicious content. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The presence of LOLBin tokens like 'curl_post_multipart_form-_data.pdf' indicates potential execution of commands to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/award?keyword=familia+aristolochiaceae+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424331/normal_6026dafda463e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fcca719e76b1.pdfIn PDF document text
    • http://mobukonenila.22web.org/outlander_new_series_amazon_prime.pdfIn PDF document text
    • https://nowezafe.weebly.com/uploads/1/3/4/6/134616333/2488379.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448986/normal_5fefa6678b977.pdfIn PDF document text
    • https://mebemawadaj.weebly.com/uploads/1/3/5/2/135295691/1540330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_60339c3a487ab.pdfIn PDF document text
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/af6b078d45556d.pdfIn PDF document text
    • https://kalujobad.weebly.com/uploads/1/3/4/3/134390175/mofujoxitofaw_xezolu_zazemakamonakor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/boy_scout_roundtable_planning_guide_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4f1f431-bda7-4e81-b0fb-45e2434fb636/manual_de_maquina_de_coser_singer_simple_modelo_3116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba571d5e-8334-4d6e-ae96-ae673fbeff37/which_foods_contain_complex_carbs.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/20814786893.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/ford_econoline_service_reset.pdfIn PDF document text
    • http://sevojaninap.rf.gd/zosebosepipejunuso.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/curl_post_multipart_form-_data.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/aligner_orthodontics_schupp.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/free_handwriting_worksheets_for_year_1.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/jevelel/formation_carreleur_cours_du_soir_bruxelles.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/gejezutafobamufomudapoje.pdfIn PDF document text
    • http://dajidagetulawu.epizy.com/first_state_super_annual_report_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/discrete_and_continuous_random_variables_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/cisco_switch_sg350x_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67303574-3943-4891-ba5e-c32de11479b1/crossfit_workout_routine_advanced.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
    • https://s3.amazonaws.com/In macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 5352 bytes
SHA-256: 56180a372f51f35ef5bb53964c6f1bd2c74db2212e0d389919a85e058df979d1
font_01_sfnt_off0000fbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 21172 bytes
SHA-256: 5bdbe5e36462fe699c9e05ccb6e2f8a9c6e771546f0ee0acd2b89e6938d0e782