Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae0657f6bbf50fd…

MALICIOUS

PDF

87.6 KB Created: 2021-03-22 12:26:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b44ef071993937db23461c692773884b SHA-1: 243bf1db3d0fdc48b92e0800761bf8a981410225 SHA-256: 4ae0657f6bbf50fd7df1af3276ffddd7b09c9de5ec501e5bbd2ea5c3e64c9bfc
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

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 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://midufefew.ru/strik?utm_term=shade+of+vampire+book+3 PDF link annotation
    • http://geleostone.online/6644984536727dmv.pdfIn PDF document text
    • http://sorebifisawug.22web.org/depumuden.pdfIn PDF document text
    • http://glossywp.online/jatarotebiswcjaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403807/normal_604f08d7c0584.pdfIn PDF document text
    • http://good-production16.site/bow_master_game_free8ko7p.pdfIn PDF document text
    • http://realnoe-obshenie.online/remington_700_adl_synthetic_stock_weightzfcyn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_5fd7eac48a58b.pdfIn PDF document text
    • http://teksalon.xyz/tunuvilapagemarumajnyn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498392/normal_5fc9b4547430c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427526/normal_60335be38d242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424400/normal_5fd8befd57545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482869/normal_60240caf2593e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_60209d9c1eff4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwigivexuvobe.epizy.com/vafajemukomezubuxoxajuvuw.pdfIn PDF document text
    • http://padekapekalerel.rf.gd/adm_annual_report.pdfIn PDF document text
    • http://vobejuk.rf.gd/task_10_conversing_in_verse_answer.pdfIn PDF document text
    • http://pebuvika.rf.gd/10._differentiation_of_trigonometric_functions_homework_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/470cc045-cd6a-4aaf-a615-12b1b17f20c2/how_is_the_grinch_described.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b84798b7-2387-4b2e-a670-79b3546eac42/redafigomifavifufopa.pdfIn PDF document text
    • http://roxonotagake.rf.gd/bundeslnder_karte.pdfIn PDF document text
    • http://zadosaw.epizy.com/88835656265.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_off000117d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D4 5600 bytes
SHA-256: cebe1f843d4b85bce85387e1fadd3191b2b10775a0abf43c116c9170a26a44c4
font_01_sfnt_off00012abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABC 11440 bytes
SHA-256: db829b2584087e9b2fcd50a37a595176d7b971c0f4c55893734becda696c0ae1

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