Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8e3fcbb5e0b157…

MALICIOUS

PDF

87.5 KB Created: 2021-03-23 03:52:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4785d584246947f98c7f88646730da75 SHA-1: b3cdb83bf1482b1c27ba5e48fce77adeab679a60 SHA-256: 8a8e3fcbb5e0b15721badd594be12cee43c40daa877b3dc683c58c660dc88afa
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a lure document generated by a tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/aws?utm_term=thermaltake+core+v1+snow+edition+review
    • https://cdn.sqhk.co/xexerekija/aogeMgj/tibuxopewek.pdf
    • http://mexicotop.xyz/como_calcular_metabolismo_basal2qfce.pdf
    • http://tojuvapemupo.mywebcommunity.org/72434947255.pdf
    • http://milktree.store/253876751054x4ay.pdf
    • http://fastcreditreport.info/best_cold_sales_email_template46pdi.pdf
    • https://cdn.sqhk.co/zimuteraf/cfsMVig/fazuminagabibenaf.pdf
    • https://cdn.sqhk.co/nurijodefa/GicAgd7/37624324606.pdf
    • http://wipunemobak.mygamesonline.org/carquest_wearever_gold_ceramic_brake_pads_installation.pdf
    • http://hayatevesigar.online/fapatuwijinewogifexesebq8p6.pdf
    • http://totalcreditcheck.info/xemumaguwasilufafomep5z118.pdf
    • https://cdn.sqhk.co/xawenano/hfib0jg/terejorosorilutaj.pdf
    • http://klokisik.space/android_studio_version_control_gitmv29c.pdf
    • http://24goodstore.site/sadijudaguveis5o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gezexibubaju.rf.gd/12605297905.pdf
    • http://jikudifotiwobij.epizy.com/business_guest_post_guidelines.pdf
    • http://mogazijanadoro.rf.gd/12177365646.pdf
    • http://ferizitemimov.epizy.com/multiplication_worksheets_with_answers.pdf
    • http://gedobesixo.epizy.com/whirlpool_quiet_partner_iv_dimensions.pdf
    • http://ragujaje.rf.gd/common_core_sheets_decimal_division.pdf
    • http://velumosak.epizy.com/appendix_3_fao_irrigation_water_quality_guidelines.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010aaf.bin
5ad3e7f9c65cd0fa4568452da4a2ca54a2dea0c94a7e0055db5d18afcbed0495
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 5184 bytes
font_01_sfnt_off00011c36.bin
7e522f805bacdf53e1bd549411e586c3c6e3cd71251f58d52ab72459bb1e4ce6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C36 11160 bytes
font_02_sfnt_off00014271.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x14271 4324 bytes