Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee59e17281298267…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 17:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dcb8afcf4d6e1925402a367735c1d0d6 SHA-1: 8b9985473fd5fb01cd2562f1bfe0228e3ae09911 SHA-256: ee59e172812982677ccf68dbeb9ab5446c39ae2e7e18de4490faacca8754887a
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The presence of numerous external URIs, many with UTM parameters, suggests a phishing or credential harvesting attempt. The document body is heavily obfuscated, but the overall structure and URL patterns point towards a link farm designed to redirect users to potentially 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 https://chcial.ru/uplcv?utm_term=sony+xperia+xz+premium+custom+rom PDF link annotation
    • http://zagazzo.com/userfiles/file/pilitamanowasavokawos.pdfIn PDF document text
    • http://ossokahve.com/upload/file/rumudetitajasuvediripemop.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/jivosikeliguruvonese.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79717373111.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/92730259524.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410de3122f7---34895601597.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/11457749415.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/vevuti.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/lilirurofivimu.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/11860592374.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/gdbuucftebrrj9bfgonq2cv2g1/pitixekolo.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/xurefonoselaza.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///faxofitekazojeseg.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/97981580516.pdfIn PDF document text
    • http://charivne.info/images/file/jefiz.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021092717282873499.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/bamezajowobinezokimuda.pdfIn PDF document text
    • http://nensi.si/upload/file/siboxajukowerobuvozikiga.pdfIn PDF document text
    • http://envigest.cz/upload/file/sujixuwagalo.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/butowagavaronimibogavolu.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/gipada.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/lumujifobowariwawefenisal.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/51084051749.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/muzinesuwobavuvuw.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/wekunugofifuzine.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_off0000b228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 14592 bytes
SHA-256: 7f5106bdc957d83f29ecd4c608890ffa9eaffea7a68c63d44ae56206a1dac3ee
font_02_sfnt_off0000ee8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8F 10940 bytes
SHA-256: 3e6725392ee4c1d3ede3f789cfded5a5de5da378f7b3d1c0fd4c9625199b1e6d