Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75214865fc2d044…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 20:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a5545cbdf75322f56196575b9ef27cc SHA-1: 64422dc820db4fa3d7f5609db83838ccfdf5bebe SHA-256: d75214865fc2d044cadb1cc1e17ff46741356bda781b651abf06d1679b10c730
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links pointing to various domains, with a heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://soi.icami.mx/ckfinder/userfiles/files/vugupulosurimovesota.pdf In PDF document text
    • https://lamthong-marchph.com/piceditor/file/numome.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/98357685735.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/28806390064.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/48905237286.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/dubulemojesuneviluxo.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72046955097.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/45001300717.pdfIn PDF document text
    • http://cke.hk/userfiles/gapuvojumabagofa.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/24632066435.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210904_AFA93BAFB4D76A8C.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/lagitudibo.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/wazotaf.pdfIn PDF document text
    • http://lagrupacio.cat/file/vekemowafa.pdfIn PDF document text
    • http://tcihk.com/userfiles/39752009677.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/93280494974.pdfIn PDF document text
    • http://superazs.ru/images/news/file/vesixos.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613375cb68aed---87183165580.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/62565252133.pdfIn PDF document text
    • https://durimawar.com/contents/files/vapakob.pdfIn PDF document text
    • https://www.poole.ed.jp/system/ckfinder/userfiles/files/bixibomuwapelirasaked.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/80589666331.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449cded14fe---89020143193.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/17533137758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+merge+photos+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_off0000b249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB249 10868 bytes
SHA-256: 886101d91439ce565317976456ef12058aa50fca316a48cfcca81f2d263abcc3
font_01_sfnt_off0000cb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB07 15184 bytes
SHA-256: 749509a9255af2048a4e6b40171ca95051032bcae01f8f6ecae5c1a2195b0bbb
font_02_sfnt_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1