Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b375d483743b7bf…

MALICIOUS

PDF

72.3 KB Created: 2021-03-23 17:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e9abc556b26bb3ff76ebfc4f0a15d779 SHA-1: 11e03a35ca5ab2507fa5ecff42fedc08bade7523 SHA-256: 0b375d483743b7bfe61f3d88c81aac2228dcd6746218a9dac81f1c9d160f93ec
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/wix?keyword=ja+economics+textbook+answer+key PDF link annotation
    • http://nakalabaxis.mywebcommunity.org/xefotejeburugosoberepa.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/44054979088.pdfIn PDF document text
    • https://zonulezewuras.weebly.com/uploads/1/3/4/8/134890742/fasarifinitaton_tizad.pdfIn PDF document text
    • http://expressday.online/guided_tours_national_gallery_singapore34ugi.pdfIn PDF document text
    • https://nolabuxovitu.weebly.com/uploads/1/3/5/3/135305824/xewodojonad.pdfIn PDF document text
    • http://zavodtriumf.com/nakibonagobafirigupofojenctx3.pdfIn PDF document text
    • http://erkutungotu.com/cloud_computing_training_institute_in_delhi_ncrfln62.pdfIn PDF document text
    • http://introdom.ru/wibojozowopiwosux34zc.pdfIn PDF document text
    • http://namsinc.info/ledekoz9gg6q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/114bdd86-84d2-400d-955a-6d42bcba06f3/how_much_does_the_average_logo_design_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b46390d-9045-4767-86f2-953990acb9d4/31368175510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aba82312-265b-4055-99a3-334ba7663443/97652313483.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/will_ecobee_work_without_c_wire.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/abridged_annual_report_definition.pdfIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_fe2ccfba3579440b947033821d5ff38c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/94667858342.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_15e7bfef4d224d0089771696aa2e2cb0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/27722903248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1835495-1bbb-4e23-a972-69ab28fd22be/cuales_son_los_primeros_sintomas_de_problemas_en_los_riones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c05d0c6e-fe02-4d1f-bf37-4480d0eedfa5/the_raven_king_explained.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/pezupusunuvemafinep.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_off0000dddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 5368 bytes
SHA-256: fa3440a09f09eb95f209fe3e9990d564cc9634c7b442770b1a8780744aca88c1
font_01_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 10512 bytes
SHA-256: 06562d7acd4f8c8a592e4a0923367c66b87e13c2b190152458ec88dec93e6ff4

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