Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91ae45764fb4ef1…

MALICIOUS

PDF

73.3 KB Created: 2021-09-11 17:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5aa28960fb8be25046b35f7e474218ef SHA-1: d168791ec751e410152eabc71a5c23e4e4006ffd SHA-256: d91ae45764fb4ef1db28780b6ecc5bc9793c7e093982efd5aa5776826542fcad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://soleilboo.com/images/uploads/files/9495608512.pdf In PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/22593235368.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/27533830352.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/gejufawenowivuf.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/lusisu.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/lofedemutodeg.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/27236067187.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/gatetidefetegezased.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6134C1473489A.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/89744877401.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/30138127409.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/30943924889.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132b02fe984c---zomisaza.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/68900137369.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210909055057.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/80128216855.pdfIn PDF document text
    • https://deepex.hu/hirek/files/sevirinewigukuwij.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/49065787053.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/rifen.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/52420705267.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/20226339785.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021932154522887.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109022157099192.pdfIn PDF document text
    • http://bubb.cn/up_file/file/binuwugirigonunipevatogod.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/dokebexasojokaderu.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/jisalenajagelekaset.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/nilozuseno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=chandni+chowk+to+china+full+movie+online+freePDF 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_off0000bc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC04 10948 bytes
SHA-256: af05abf04f289f8313475f97bb50d95731f5515f7ff8e7ecb1f9c859661dc7ef
font_01_sfnt_off0000d543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD543 16136 bytes
SHA-256: 170daa1de7e7318d83e67dc742f260ec475b83183cb3f449911372d64441c7be
font_02_sfnt_off0000ff56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1