Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e28c1da610e27eb…

MALICIOUS

PDF

68.5 KB Created: 2021-09-20 06:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d8e5c6b80c49c2a27db9c46a87055416 SHA-1: b70fc55b523b9ff8f307ead019690271721a0e80 SHA-256: 9e28c1da610e27ebdd5d035fd9a497146d4ed3a4369597278889a6ef614c9639
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=best+app+to+download+manga+free PDF link annotation
    • https://mehreganimaging.com/images/upload/files/44457224793.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400951ecc8e---67836878985.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/futadodige.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/63749844532.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/8322129448.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/tazojaro.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/98828028057.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/mesuwifimubemumatisuboxew.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/dotapimaxalub.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ad1df08f---28351736412.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/5069967672.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/57749256531.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/tesumaselane.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/nefurututegit.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/13743396027.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/wemizad.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/binijijuwimezasupixixoso.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/23048970775.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/72855222673.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/turuburebit.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/81862661292.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/7587202598.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/vizaroxoz.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/tetixaxabatevatej.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_off0000af59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF59 10888 bytes
SHA-256: 1575b2de13a19e524144cca9aa4e54568a091a94c7394d69b995bfb1b91b703a
font_01_sfnt_off0000c86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 14352 bytes
SHA-256: 8a36cf7673f95a96a8d8e04c61c12673c05783c64628f1a35ca44bdfcc223034