Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c31c764061dabc4…

MALICIOUS

PDF

86.4 KB Created: 2021-04-15 05:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 883ee2d9b34c05bbcea8757b1828107c SHA-1: 6031282b78d3bbb23c72446e63ee2533a1b50aac SHA-256: 9c31c764061dabc48841201521e41874bef8cfbf9d4844f5b74fab214e317925
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/strik?utm_term=q+see+dvr+16+channel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462681/normal_60269c2e106f8.pdfIn PDF document text
    • https://cdn.sqhk.co/gikunixa/Hjgihjf/48828866321.pdfIn PDF document text
    • http://dajexori.mypressonline.com/the_bedford_researcher_5th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/xurakipigub/egeha3t/cuba_travel_guidelines.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/adobe_scan_digitalizador_de_ocr_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/buganixezu/Gjcje4v/34859755925.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/hd4aieJ/dreamworks_universe_of_legends_characters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465128/normal_604745ea25776.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488560/normal_5fceeb0740a52.pdfIn PDF document text
    • http://xomofaki.getenjoyment.net/nurse_anesthesia_books.pdfIn PDF document text
    • http://livemavuxedu.getenjoyment.net/business_english_words.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/cxEzjis/dakatuk.pdfIn PDF document text
    • http://losasawavezu.iblogger.org/amido_ceroso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_602ad34dd2247.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_78277e0ec6a64a3391066285fc607f5e.pdf?index=trueIn PDF document text
    • http://niwirafe.rf.gd/themes_in_the_book_blossoms_of_the_savannah.pdfIn PDF document text
    • http://molitumulejoji.rf.gd/manage_budgets_and_financial_plans.pdfIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_282eec15d4764c51a6555c2f88269105.pdf?index=trueIn PDF document text
    • http://nedeponup.rf.gd/97879809251.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_94883ec553e2495c8e563824d26b2071.pdf?index=trueIn PDF document text
    • http://medazupu.onlinewebshop.net/37748209199.pdfIn PDF document text
    • https://ac25a69f-a984-4293-9c3d-8c9e0f062535.filesusr.com/ugd/cbf077_ddee16d93ee24d139d1cf58fafe04b4b.pdf?index=trueIn PDF document text
    • http://xitutudatiri.epizy.com/midojisukisogaxujavejax.pdfIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_6d996fb545a04cbaa82673c14962eab2.pdf?index=trueIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_91622e9aee6e4b56b63690ec9da63757.pdf?index=trueIn 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_off000114cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 5356 bytes
SHA-256: 0488ab820a68023f52e0dd9e3a6247832ecc91644fd631457bbc1c21dc4bbabc
font_01_sfnt_off00012704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12704 10964 bytes
SHA-256: 8128a5d9b337d20d1ad5f2ae6f81f8eb2eef9aedcc2cdc1a27de751db474186f

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