Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63d0af808daca39…

MALICIOUS

PDF

78.9 KB Created: 2021-09-11 04:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae34f3e0f9ba7d97b343be4763ebb7df SHA-1: 01ed30475ac22ad64e887e018aefba497472676b SHA-256: d63d0af808daca3935da192e85c6051027331335b40a4484c6f7522ddae9c517
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains or are structured as link farms, suggesting a phishing or redirection scheme. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to deliver malicious payloads or 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://fonnepal.org/userfiles/file/xiluzowumusekozigedufuju.pdf In PDF document text
    • http://osmed.cz/app/webroot/files/files/47484480488.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf5081a23f---50422383289.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/40251706124.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/wesexuvevuvajajarolewe.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/23413903838.pdfIn PDF document text
    • https://melz-feu.ru/upload/fowojepozoda.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9cc276342---kuwekisuzat.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/zilejuxozevofodamizawebav.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/tefivupidukejipep.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/70270283364.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/rozekarajimet.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/sukid.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/dezaxotujamemuniga.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/49909654333.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/70324824121.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/lexajepevibuv.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/jebukimovagomuramubab.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/18164827574.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/10284837888.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/63232706050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+turn+off+auto+message+on+androidPDF 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_off0000cf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 10828 bytes
SHA-256: 878eccb7512a6c6dd169b50c2e909a72258cf2df33c03b30b14f435ea2eec2cf
font_01_sfnt_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001004e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 17836 bytes
SHA-256: b9cf32f67ec2c3b02cfc2e3010cfe56fbdbfc10645d5bf7bd7542dca7cc44a93