Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcee36f364e5ac99…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 06:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 749de9413e6f6b0a1b75aab4bd12b167 SHA-1: f6ee2522205698dc1a693c921d3649ac2943176c SHA-256: fcee36f364e5ac99b03b9cce0e114e297913f985653a6c1fd8c26b4918359f9e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=how+can+i+edit+a+video+on+my+android+phone PDF link annotation
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/mavedatulatuda.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/kagesebokadokemuzefurupar.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/93709832918.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/nivususidejunazutu.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/28173997287.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/xubimise.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/14437561752.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/gomadavupebasemaleboxozeg.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/46824250030.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/682253877.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/sakobuwadixun.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210906_4ADB19C949F94C8F.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/13394574860.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/rivepufipena.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/91633675203.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/jobexevibet.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/70670403513.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/49685147495.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/38904595774.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/dorupavakadewu.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/gibosajize.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/xodebizakibubowo.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/88888942106.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8d22fdb6---webusowunubapowerexavo.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_off0000d17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17B 18348 bytes
SHA-256: 9db6d337437030849f81eb5048e879a8c2d75d964eb72649271317a769a0d37d
font_01_sfnt_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 10824 bytes
SHA-256: 7a8f12b9385802564ddf9def8314cb1f3ce5ec414bc070a4136a189e91849576
font_02_sfnt_off00011a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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