Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70252f6389bf664…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 21:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a1498524c16335cb302b755be8c1e90 SHA-1: 7541af7c9477a7bad99db7851e337d167a01a25a SHA-256: f70252f6389bf664f8c448aaeb67a8a31b3d0aa5e20dbd01b3cd7447b1f97976
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://jfe.hk/userfiles/5537484812.pdf In PDF document text
    • http://sinhorelli.com/userfiles/file/xadajoxomoledutitujokaga.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/r4g9d48sqvc3km9rt3omddfaec/jugunejamekigagareki.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/wawizutegates.pdfIn PDF document text
    • http://www.moyekolodin.com/files/kolukalewegabujemus.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109262034401705.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/80424338177.pdfIn PDF document text
    • https://moscreen.in/cmsfiles/file/92508256391.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/vopijevekiwewa.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/94613998732.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/famogabag.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091609140973499.pdfIn PDF document text
    • http://stringladies.cz/userfiles/39868237686.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/zekudun.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/kamubitorobabukiji.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/pirexilotokakit.pdfIn PDF document text
    • http://synfarm.com/upload/files/ximajegetufanupumuromese.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/molawikojatudifaxipib.pdfIn PDF document text
    • http://balony.dmuchance.eu/userfiles/file/xifepubolojun.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150bd4ee9243---gakowomosaperuwijuwol.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/30547730879.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/5640869895.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/13157369610.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/gifawunopalakimanomoziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=calisthenics+workout+plan+advanced+pdfPDF 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_off0000b045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB045 16340 bytes
SHA-256: b83daf2b5b40eaf49a2132bb9278852ebe578f485e50836a3bf4da4480ebaa9e
font_01_sfnt_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 11092 bytes
SHA-256: b7705653d4d5f3e2f35a7b1fc1771c772273a81e0b3143dc164b3d4d797085d7
font_02_sfnt_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1