Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b663596c3a7416…

MALICIOUS

PDF

78.7 KB Created: 2021-04-26 03:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e65ccdfdd15608ef3a729b52fc0b924 SHA-1: 26e090f1e3d5c0336dca11dae5fc41e5c9d43536 SHA-256: 94b663596c3a7416772078cbaec1568809b20d87f08afa7bbd5728b40f360702
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified as a link farm, with one prominent URL pointing to 'jacksth.ru'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=chemistry+unit+5+activity+relative+mass+answers
    • https://cdn-cms.f-static.net/uploads/4470968/normal_602ff8e944131.pdf
    • https://cdn-cms.f-static.net/uploads/4369504/normal_6054be63723cb.pdf
    • https://rajitogo.weebly.com/uploads/1/3/4/3/134377965/d543b3d.pdf
    • http://terakusinuw.mypressonline.com/20165991799.pdf
    • https://dizavobezovedup.weebly.com/uploads/1/3/5/3/135313146/5509054.pdf
    • https://ramorebuba.weebly.com/uploads/1/3/4/8/134898890/f35c621ffa1.pdf
    • https://cdn-cms.f-static.net/uploads/4375699/normal_604c9bda4e162.pdf
    • http://peguxukeziku.sportsontheweb.net/adolescent_health_care_a_practical_guide.pdf
    • https://zajoralesame.weebly.com/uploads/1/3/0/9/130969459/4512758.pdf
    • https://fejilexa.weebly.com/uploads/1/3/1/1/131163980/3804463.pdf
    • https://topirameji.weebly.com/uploads/1/3/2/6/132682330/208c65f7760.pdf
    • https://toxoladosa.weebly.com/uploads/1/3/4/4/134479392/6c80eda5fd.pdf
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/texamoka_jidaxofowik_dufezuzozajojik.pdf
    • http://rekugegik.scienceontheweb.net/jiwaxezodig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b45ccfd9-e580-4229-bc77-5eaab811a921/wumok.pdf
    • https://uploads.strikinglycdn.com/files/57d857c4-0d8b-4be6-9525-f4fd994552f1/business_phrasal_verbs_worksheet.pdf
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_fb4e4b340e254511a77f752d302f2b55.pdf?index=true
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_12077919559644aaa3cffbfa26479cb7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ee938d03-383d-4bf2-afa0-b0e2c2331a15/66546693930.pdf
    • http://vebagakid.onlinewebshop.net/sawemoneposi.pdf
    • http://gafijid.atwebpages.com/83301669167.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_off0000f4ef.bin
60b6ff454e90c8c95a1afc05f575aa8aebd25578d142aff273d6435eeac7a23c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 5324 bytes
font_01_sfnt_off000106f5.bin
a6f3639bf94003613663ea18f94a42422ce7917afa12f90cba029d12b6a13d41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 10704 bytes

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