Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d4de105dfd12fb…

MALICIOUS

PDF

84.0 KB Created: 2021-03-15 16:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d85bb3a8afd35f98db662e02a4909ccc SHA-1: 24f1e5559fe98b4ee5407ce899b81be830ba3045 SHA-256: 18d4de105dfd12fb4ec68b74c6e7c4bbf7ac962aa332b4fa31a04ac79495fef0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

The PDF file contains heuristics indicating it is a phishing lure, specifically designed to trick users into downloading something by offering a link that promises a free download. The embedded URL redirects to a domain known to host malicious content, and a critical heuristic identified a PHP webshell (WSO 4), suggesting the ultimate goal is to establish a backdoor on the victim's server. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PHP webshell / backdoor source critical WEBSHELL_PHP
    The file contains PHP server-side code with the signature of a webshell/backdoor (named PHP webshell banner (WSO 4)). A webshell takes attacker input from an HTTP request and runs commands/code on the server. Flagged as a malicious hacktool artifact even when carried inside a document or archive — the code does not execute from the carrier, but the file is a webshell.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/strik?utm_term=logic+pro+x+macbook+air+2015 PDF link annotation
    • https://cdn.sqhk.co/xonudutixova/b9ihcjh/63745426129.pdfIn PDF document text
    • http://podarokinsta.online/lutatumuzodudovatidupefozjm5s.pdfIn PDF document text
    • https://cdn.sqhk.co/jegisizozul/JvzhiiO/bike_race_3d_free_download.pdfIn PDF document text
    • http://jaraxusej.iblogger.org/advanced_cost_accounting_objective_questions_with_answers.pdfIn PDF document text
    • http://gatorama.fun/should_be_fine_meaning_in_marathi3rcta.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/dijhOjg/mortal_kombat_11_characters_dlc_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/ggvqihc/nafixusu.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/g_shock_watch_shop_near_me.pdfIn PDF document text
    • http://mokenolovulonom.medianewsonline.com/68390150681.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://petizitopebil.epizy.com/59197644071.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/66378492752.pdfIn PDF document text
    • http://gafodix.myartsonline.com/python_convert_ip_range_to_list.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/10172095525.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/vasoxefasuzog.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/saudi_aramco_oil_company_annual_report.pdfIn PDF document text
    • http://mujunuge.rf.gd/11519876861.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/which_is_the_best_denture_adhesive_uk.pdfIn PDF document text
    • http://gemixeferakin.rf.gd/aiou_solved_assignment_2018.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 5704 bytes
SHA-256: cfcbc084a092eb8a75a5288be8e6a9424a269ebc954d8f33400e879be073729d
font_01_sfnt_off00011b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 11132 bytes
SHA-256: 561fe1c392b0bb6226b33b143d29d0a834099579ca10d37b48e633a74d900443

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