Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81e60911221c2d8…

MALICIOUS

PDF

71.8 KB Created: 2021-09-14 21:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 410dffd94672f4c2a5d9b0901424dc6d SHA-1: abe977224ed7f0372d6291834c3534407dd01d98 SHA-256: b81e60911221c2d85496b396c257344ae4aef7823a151c5cc0862bcfa42dc143
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://devitohomesorlando.com/userfiles/files/sazab.pdf In PDF document text
    • http://www.workbythai.com/admin/assets/images/40440129060.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/54883949765.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/dosepubupativokiri.pdfIn PDF document text
    • http://getdol.com/page_data/file/48378985393.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/rojid.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/90631470472.pdfIn PDF document text
    • http://master-vin.ru/files/file/61743673860.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109101149045115.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/sidaxowanitenak.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/87381148520.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/gr1b8bp0ft9kpaekqj2t9cksqr/28338960001.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/fizidedibusavi.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/14744072330.pdfIn PDF document text
    • http://vo23.ru/upload/file/diduju.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/43497683095.pdfIn PDF document text
    • http://mqskin.com/luutru/files/bulifowot.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/tavodenijawixaxas.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613142ee8078b---zagunaluvagumivopipeb.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/gobinuvisutawitogazex.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/25582487599.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/31775503012.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/rotugukijuxokenis.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/masezupajijudowesuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hanuman+chalisa+lyrics+tamil+pdfPDF link annotation
    • 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_off0000b38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38C 17592 bytes
SHA-256: 935f47cc9ab1a9b78f35bd0d3a749f3f67cc1c1ac9dd4f1ded24e7cfee9442f9
font_01_sfnt_off0000e09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09F 10840 bytes
SHA-256: 9445f30405f1436f2d6c2675dccf342a2a7327ff314727132d8db766196ff3f9
font_02_sfnt_off0000f960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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