Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b61406bf56fedec…

MALICIOUS

PDF

83.5 KB Created: 2021-03-26 18:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a34cea00837819081144a5474cf8fab2 SHA-1: 781dfe80c8e68561b4c8b1aad14f72ae68858808 SHA-256: 4b61406bf56fedec6eceb23d27d27fbb547d4e6097338d307544595ce3851f32
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary URL pointing to a domain associated with phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links suggest an attempt to redirect users to malicious websites, likely for credential harvesting or further malware delivery.

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://mezovuduw.ru/award?keyword=paisabazaar+credit+score+pdf+password
    • https://static.s123-cdn-static.com/uploads/4460476/normal_5fe5ec28095ec.pdf
    • https://cdn-cms.f-static.net/uploads/4500001/normal_604075d42ca8a.pdf
    • http://zutolewe.mywebcommunity.org/56752657324.pdf
    • http://zodimasar.mypressonline.com/woxawixerafezalajilina.pdf
    • https://cdn-cms.f-static.net/uploads/4390366/normal_604f79e29d6e4.pdf
    • http://rixujewo.getenjoyment.net/14932979404.pdf
    • https://cdn-cms.f-static.net/uploads/4451039/normal_6030368e831f2.pdf
    • http://gupirigugorixuf.sportsontheweb.net/public_speaking_and_civic_engagement_free.pdf
    • http://lutefadeba.scienceontheweb.net/xadolivipawegivifufimab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wizakokowe/43803307405.pdf
    • https://s3.amazonaws.com/bivanud/autocad_3d_blocks_free.pdf
    • http://susesibukof.epizy.com/frequency_counter_project_report.pdf
    • https://s3.amazonaws.com/labitajaxatufib/mododapujagomabita.pdf
    • https://s3.amazonaws.com/rezugekolaba/10088477761.pdf
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_07920bfc225640fe8056a9bd4c872a44.pdf?index=true
    • https://s3.amazonaws.com/vukujidor/kaxep.pdf
    • http://sabajuvarotu.rf.gd/bosch_brute_jackhammer_repair.pdf
    • https://s3.amazonaws.com/waduzirader/nugisuvukenekuxewudanije.pdf
    • https://s3.amazonaws.com/tosego/aadhaar_enrollment_form.pdf
    • http://dolipunifaz.epizy.com/baltasar_y_blimunda.pdf
    • https://s3.amazonaws.com/tevomenil/music_note_clipart_clear_background.pdf
    • http://kitomov.epizy.com/xbox_360_wireless_controller_instruction_manual.pdf
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_b4b619c648f0461d94e1e1929c0297ec.pdf?index=true
    • http://mimiruwonaru.epizy.com/edexcel_a_level_psychology_textbook.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/angry_birds_epic_google_play.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_off0000ef7e.bin
be4d547e7f61e465a3854a7bae7605e8ce9063270312d87dd12e3e8e6260d65d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 5400 bytes
font_01_sfnt_off00010201.bin
7093a41d0c40e159f2b25218171d6357b5321466a378fd0b47c512387d8f20d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 12504 bytes
font_02_sfnt_off00012adb.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADB 16204 bytes

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