Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db8bbffcfe47ef3…

MALICIOUS

PDF

70.8 KB Created: 2021-10-03 02:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f9ec0af5564ff34a57d7b04f2d11741 SHA-1: 18f067c715bec4362a0360bdba8a29fba9d01c6e SHA-256: 8db8bbffcfe47ef334a03123952a76203143190fa0a2f0ca4f4764fa0fa420cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=speaking+exercises+for+english+learners+pdf PDF link annotation
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/20901885170.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/e694b6d65d6466684e117e9141d49817/rofejefojizewemi.pdfIn PDF document text
    • http://kisito.com/userfiles/file/modotumazakasojosuze.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/zefexo.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/rupufevifenidadamemazuru.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210927081325.pdfIn PDF document text
    • http://101balkon.ru/upload/files/4222073351.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d909681733---bomiwimudu.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/bogamabe.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/webones.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/65976443877.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/ragefaxumopetodekapij.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/vepokajuribobefexobur.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/22848840731.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/25934533758.pdfIn PDF document text
    • http://okvin.org/userfiles/file/letazomazibatebez.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/somakarevutuno.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/wibovajizabusatekuwosat.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16151cbc696c52---bamipovaluvaveremokunifu.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/zomekutefi.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/7496623329.pdfIn PDF document text
    • http://bienbao.org/uploads/files/reparakomeg.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B4 15936 bytes
SHA-256: 1e02401bc5d4032c7064eb167c8f08fe286e82fe8c41b75b176777ade0a4beda
font_01_sfnt_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 11068 bytes
SHA-256: 85c07589aaa4067bcd162881083dba1d85e76fb3594c01af314b6978a0005cd8

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