Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75bb68d24a4367b…

MALICIOUS

PDF

71.8 KB Created: 2021-09-29 01:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 31993194058773db942dfb8eb0a4c5f8 SHA-1: 70355097b8aa64d0340fb67bd6d421c5cc83da8c SHA-256: f75bb68d24a4367b54b8ebfd9e0e4250283675aaed2bc4efdf81808441918a1f
126 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it is a link farm designed to redirect users. The PDF contains numerous embedded URLs, many of which point to unknown domains and are structured to appear as downloadable files, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and heuristic firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://ayurveda-shiatsu-nice.com/upload/files/17465506395.pdf In PDF document text
    • http://nicenpos.com/userData/board/file/fefumowaxep.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/47047084303.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/nufivu.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/xarusimadiramoteb.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/sagavifomozobukijuloludej.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/piliv.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/jobefolebenewunenisin.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/6458918090.pdfIn PDF document text
    • https://mediaskills.rs/files/50695743665.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021092802124048.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210924040357599.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/40442855128.pdfIn PDF document text
    • http://aa-nusd.jp/48813886189.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/67009260262.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/zalivazo.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/91202998691.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/feleridiwaxaf.pdfIn PDF document text
    • http://balone.net/_upload/file///47141521684.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/luvewofitewofejunabi.pdfIn PDF document text
    • http://castel.lu/userfiles/files/59394632075.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/50755890246.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/54710776107.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c67979e83e1c0c8dd5a0185a0541db5e/mebawusepiduwujogosifo.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/22035511058.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210914054634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=telugu+movies+online+movierulzPDF 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_off0000b554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 16828 bytes
SHA-256: ddaa3039f0f5557600125a6334a748b7f9e9ee1df2b6925135555fdf2f26408e
font_02_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 10380 bytes
SHA-256: d28d8abb2bf0ad8fd407c2074841d07976ba93f87cf268c48b21d69cc0b6c2d6