Malicious PDF — malware analysis report

Static analysis result for SHA-256 6198c7089b8a6df9…

MALICIOUS

PDF

75.1 KB Created: 2021-03-19 08:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf43eee7a2b10e6ea0609dbd8d8edd51 SHA-1: ada3137dc651c5dd2e9856fc4f308222fe42be92 SHA-256: 6198c7089b8a6df98fec555154de2e70c11fe727e55f474ce00e50e375a7c463
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains an embedded URI pointing to 'https://jacksth.ru/strik?utm_term=can+chernobyl+still+kill+you', which is highly suspicious and likely serves as a lure for malicious activity. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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://jacksth.ru/strik?utm_term=can+chernobyl+still+kill+you
    • https://cdn-cms.f-static.net/uploads/4373522/normal_605218ae53e73.pdf
    • https://cdn-cms.f-static.net/uploads/4420927/normal_6053ddbf340b3.pdf
    • https://cdn.sqhk.co/vonitumefide/whOuhaX/barbie_dreamhouse_adventures_go_team_roberts_wikipedia.pdf
    • https://cdn-cms.f-static.net/uploads/4369516/normal_604e4c072d4b1.pdf
    • http://jenuxijaf.mygamesonline.org/copd_action_plan.pdf
    • https://cdn-cms.f-static.net/uploads/4493195/normal_6015db2418ae7.pdf
    • https://static.s123-cdn-static.com/uploads/4383698/normal_6008ce86f3508.pdf
    • https://cdn.sqhk.co/rirerujel/jhiae8W/42300092563.pdf
    • https://static.s123-cdn-static.com/uploads/4489983/normal_5fef9cfaf2cf9.pdf
    • https://cdn-cms.f-static.net/uploads/4383334/normal_60351e89d1bb8.pdf
    • http://sosogemizibu.mypressonline.com/92620689960.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/silubebebefuju/wosewepezafaradibejufo.pdf
    • https://s3.amazonaws.com/zuniverijesud/blast_nt_database.pdf
    • https://s3.amazonaws.com/fedure/hack_wifi_wps_connect_apk.pdf
    • https://s3.amazonaws.com/wumodukubaru/50312034795.pdf
    • https://s3.amazonaws.com/fejakixoweka/71589084805.pdf
    • https://s3.amazonaws.com/fizufapu/iowa_code_232.28.pdf
    • https://s3.amazonaws.com/genedonapubefe/bunep.pdf
    • https://s3.amazonaws.com/jivamubug/50_shades_of_darker_full_movie_download_filmywap.pdf
    • https://s3.amazonaws.com/fojaxexino/609139422.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_off0000e860.bin
eba6103a57d8c4b88694dceb80cd00e7a26bdd84098e6978dd00faac4ba8422d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 5100 bytes
font_01_sfnt_off0000f9b0.bin
683c1a5ce29aaa6c8ca5506fcc0316fae959aa5dc30b65d6d0c29e8dd3ec3e9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 11232 bytes