Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23b811a9426eff6…

MALICIOUS

PDF

77.0 KB Created: 2021-04-03 00:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e71789c7578d2f2e4a4c77531f07c197 SHA-1: bcedae2d239e24491f9c85417c61f8e04319ef40 SHA-256: f23b811a9426eff6dcf650190494baca463dfab58d1d28e5b64588f21cc395e1
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on low-reputation domains, a common tactic for distributing malware or conducting phishing campaigns. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=the+emotion+machine+summary PDF link annotation
    • http://viwavidif.getenjoyment.net/weboramusapulej.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/sediriwigekebovejuxifeko.pdfIn PDF document text
    • https://nopolojeg.weebly.com/uploads/1/3/5/3/135349815/5e43f9388aeca68.pdfIn PDF document text
    • http://lilozekakotelup.sportsontheweb.net/cell_biology_of_extracellular_matrix.pdfIn PDF document text
    • http://aduo5.online/199422976669jv.pdfIn PDF document text
    • https://pexagizim.weebly.com/uploads/1/3/0/9/130969673/zukezetomoxax_darifapek_rufazuwusekebom_pisozi.pdfIn PDF document text
    • http://vuvopogawuxaxax.22web.org/abdomen_ultrasound_scan_report.pdfIn PDF document text
    • http://xagakojitogiva.getenjoyment.net/adjetivos_para_describir_personas_en_espaol.pdfIn PDF document text
    • http://nabuvegawemuk.22web.org/kimoxev.pdfIn PDF document text
    • http://itwow.info/43821681211ahkk1.pdfIn PDF document text
    • http://fonujameritules.getenjoyment.net/ansys_workbench_documentation.pdfIn PDF document text
    • http://sarkife.site/rikopawsfy7s.pdfIn PDF document text
    • https://govotewimodiku.weebly.com/uploads/1/3/4/6/134649218/3908021.pdfIn PDF document text
    • http://cleaner360.shop/can_the_dash_diet_lower_blood_pressuremwy16.pdfIn PDF document text
    • http://jiludedo.iblogger.org/relationship_marketing_definition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roluvad.epizy.com/tilelikakaxekoxukufatob.pdfIn PDF document text
    • http://desejole.myartsonline.com/92246593237.pdfIn PDF document text
    • http://xugowosapiri.rf.gd/gubovutavimufatodebub.pdfIn PDF document text
    • http://pawuzax.onlinewebshop.net/psychology_color_test_meaning.pdfIn PDF document text
    • http://gikunipif.epizy.com/22346478668.pdfIn PDF document text
    • http://gafodix.myartsonline.com/22978408916.pdfIn PDF document text
    • http://nijetazum.epizy.com/definicion_de_catabolismo_y_anabolismo.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_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 5056 bytes
SHA-256: d175ab51ae8e08e3ed43c0818e7e86aaacd4e943bd67869e71ed951601ac5300
font_01_sfnt_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 11012 bytes
SHA-256: 6de9ebcd58f6ef43ce760df2b26b13b2001a7c6cde6151060f1476c718846c5b

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