Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbef7a73a5d0226a…

MALICIOUS

PDF

75.0 KB Created: 2021-05-11 09:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a5e2f0ac2ffaf8842aeccd3cdd915ac SHA-1: 7585b30022a572fc8894329a00d16542c049cb07 SHA-256: fbef7a73a5d0226a0980dce46d3b70781ab82ca2f34f99e4d729faece1b2bfd1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/strik?utm_term=systemverilog+virtual+interface+class
    • http://nopuvobetag.mygamesonline.org/collections_class_in_java.pdf
    • http://profapp.pro/chemistry_class_12_notes4yjic.pdf
    • http://siwosupegejolop.medianewsonline.com/48807857234.pdf
    • https://cdn.sqhk.co/vewukiziwemi/ghhhfL9/wodoju.pdf
    • https://cdn.sqhk.co/gunonutib/bviciWV/angelus_paint_brush_cleaning.pdf
    • http://terem.space/frick_ammonia_compressor_training13015.pdf
    • https://banezinalirunod.weebly.com/uploads/1/3/1/4/131437453/julazitiwibinosuje.pdf
    • https://somalinoduka.weebly.com/uploads/1/3/5/3/135392385/fiwonuvuxiwi-zorakajowogupi-gazetarefogebuk-fakipekitokudi.pdf
    • http://robolab.one/sea_of_thieves_pc_errorg8oti.pdf
    • http://hrushch.space/lg_inverter_direct_drive_dishwasher_water_not_drainingt85t8.pdf
    • http://megesodore.iblogger.org/zanussi_integrated_dishwasher_installation_guide.pdf
    • https://pujonavow.weebly.com/uploads/1/3/5/9/135958036/4dab2902ed4c.pdf
    • http://mirijesuwakug.sportsontheweb.net/savut.pdf
    • http://itasda.online/64587384323q6nan.pdf
    • http://sasegotib.medianewsonline.com/12587446021.pdf
    • https://cdn.sqhk.co/mevazasid/ghicMZH/rofefanuzezulugot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_72b8f7114da7463baadc757361c1e1be.pdf?index=true
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_e1366ce9f5e548e79fc7b61b66ab7ab6.pdf?index=true
    • https://09af0a6c-c0e6-47ff-90c1-5b173435ccd1.filesusr.com/ugd/b92b66_0bb3d6c7675341d98cfe6ec9d33c9b62.pdf?index=true
    • https://9b56c271-8e60-4ff0-96d1-8930f8c082f8.filesusr.com/ugd/5a1ab0_9eccd3fbbbc34a868523ebbcc7376e1d.pdf?index=true
    • http://vexabimumemig.atwebpages.com/awakening_the_third_eye_free_download.pdf
    • http://buzabokinoka.epizy.com/xofub.pdf
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_9d2e27d93f644832a6c16c90069213f7.pdf?index=true
    • 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_off0000db17.bin
2c1e27f9292b4745aca961ed5cfb05e3a184ef49e50fcb8aa061a8576dc5595d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 5468 bytes
font_01_sfnt_off0000eda2.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 1800 bytes
font_02_sfnt_off0000f630.bin
b1ecce904e47d3003010b7360869c475db99e68e0a087e82264cfa8a2ff50091		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 11588 bytes

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