Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d66bf4cab1d30b…

MALICIOUS

PDF

89.4 KB Created: 2021-04-10 04:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7df211d0048fa1c38d6d1f20685135a3 SHA-1: 40c03ca26ff381c9a95d3a61f4e11f10625c76b2 SHA-256: 50d66bf4cab1d30bced079728aac6a97e7d6d902b97e598393ca5730955f4464
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other file-hosting services, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://fokemale.ru/strik?utm_term=fl+studio+free+packs PDF link annotation
    • https://saduzoxizujakef.weebly.com/uploads/1/3/1/0/131071125/zokegin.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/lubuvilo.pdfIn PDF document text
    • https://cdn.sqhk.co/fonazovep/sQLjbfv/xajonaxojujajetitetukima.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/xikumifawikaxuvewa.pdfIn PDF document text
    • https://zipawesijapa.weebly.com/uploads/1/3/4/4/134494223/jixosilujoxarof_vokudas_lanexuditole.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/4rMsjge/swingman_logo_nba.pdfIn PDF document text
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/dideladepumos.pdfIn PDF document text
    • https://cdn.sqhk.co/difakezil/iatsAdZ/wizopifatanurij.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/idijifm/all_cheats_mod_sims_4_university.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/gjdhggg/muliz.pdfIn PDF document text
    • https://rutimupon.weebly.com/uploads/1/3/4/6/134629179/pisejonu.pdfIn PDF document text
    • https://jirorenuges.weebly.com/uploads/1/3/0/8/130874518/romiweru-sanukatikisogi-pepixojemajol-wesuxujubaxegaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/walozubovek.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/96020213258.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/gijivijowavopamoveku.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/fallen_order_star_wars_timeline.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/best_patterns_for_day_trading.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/realisateur_the_elephant_man.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/32089964716.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 5168 bytes
SHA-256: bb42d93a4aa2cc5184f2d8bf983a2752a039e8ace3d1284473209e9e0a72621e
font_01_sfnt_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 11792 bytes
SHA-256: 9bdce877ea32d5941908883843fab1fc7e57d12293a25d0f01800d5e99b23a67
font_02_sfnt_off0001430e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1430E 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140

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