Malicious PDF — malware analysis report

Static analysis result for SHA-256 073de53dc606b49a…

MALICIOUS

PDF

76.0 KB Created: 2021-03-09 05:17:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b601a8bd202c9e837a9444b5eedd2e29 SHA-1: e57a2faecd7918de6f6f6af0597080b0e0019192 SHA-256: 073de53dc606b49a401ec7c67be0495511012cd2ac569767be9e147f5095af04
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://ponafet.ru/123?utm_term=cub+scout+bear+leader+manual PDF link annotation
    • http://vetovikaxu.mypressonline.com/pajifezaxudu.pdfIn PDF document text
    • https://kurepisafigovu.weebly.com/uploads/1/3/1/3/131398088/968684d3ae.pdfIn PDF document text
    • https://vepazigomopu.weebly.com/uploads/1/3/4/3/134398405/xobofoterawukurabev.pdfIn PDF document text
    • https://vijapuloxo.weebly.com/uploads/1/3/0/7/130775263/fozemoxel_rubazo_kazazegas.pdfIn PDF document text
    • http://choosemadam.site/delta_monitor_1700_series_shower_valve5acmh.pdfIn PDF document text
    • https://xiwigelu.weebly.com/uploads/1/3/4/6/134644840/579f24a74c8.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/5497468374.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/pekujanufakivtokf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lumosaneja.onlinewebshop.net/11014294666.pdfIn PDF document text
    • http://vejegaba.atwebpages.com/13018631458.pdfIn PDF document text
    • http://nakeviw.myartsonline.com/52634047208.pdfIn PDF document text
    • http://monimupanib.epizy.com/review_of_angles_in_regular_polygons_worksheet_answers.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_a574ad4099b54bda87e5d9f2956b7a2d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/kebogepekimoli.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/doraemon_switch_guide.pdfIn PDF document text
    • http://vobewegogiz.rf.gd/didisuliperusokejuvo.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_452345e3859b473abced058805c995e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/juzerib.pdfIn PDF document text
    • https://a4067306-84c0-45ce-9c36-3cbb795fcb37.filesusr.com/ugd/d5b970_d01819f0caff48cab2c13dea46bda86f.pdf?index=trueIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_24a51b0ff458473990f27ce265b1606f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujapomib/how_many_books_are_in_the_discovery_of_witchcraft.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/bokassa_crimson_riders_free.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_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 5128 bytes
SHA-256: a821184a2c7b15bdcbfa5dadf832daba4f157dfb43ed3a366fff80909ee8b254
font_01_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 10480 bytes
SHA-256: 5ae5b2cfe2fab71dca4dfddb857acfa12d0474a7fa70f62ca59e91737898c214