Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3fce0b7eb473d99…

MALICIOUS

PDF

79.5 KB Created: 2021-09-14 17:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ad21940dacc8b84ac6b845b4595d926 SHA-1: 19744f71724c2d0a70c6563bd0936a6e8c7d9354 SHA-256: d3fce0b7eb473d99fe85d5671c54978c267ab30172929ac71cf8d8ce7fabc692
146 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant number pointing to disposable hosting and forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of an IP address literal in a URI further supports the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://szhlfz.net/upload/mubagatotul.pdf In PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/9933611585.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a856717f90---67399355076.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/5518461868.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/87171889704.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15973207139.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/kajabo.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/poferunuwebulexonoxadew.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b7f091a8eb67edb9876f1cc79575ff2a/funejoma.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/zuralojoke.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/wezuwat.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/89323227680.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/kumotusifumizig.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/xaxesujipufogatax.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/muxuzerimubunivuw.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/japoluxamenotilejirodar.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/24148920121.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/wibikerewanexogojasetob.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/38323945027.pdfIn PDF document text
    • http://analhospital.net/file/files/fapekavawa.pdfIn PDF document text
    • https://virker-ikke.dk/files/93480783869.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/27967048491.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/49303275024.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/zesixewodidomomawesiper.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/wewufevaxeruwodefoxa.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=all+mechanisms+in+organic+chemistry+class+12+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_off0000cd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59E 11336 bytes
SHA-256: f51bc6a596ec35e38423a72b06b1ad77e5803471eb8cf189cf2ea8d812506ce4
font_02_sfnt_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 18400 bytes
SHA-256: 197c40a111b83961ff94063221fb1ad1f964d9af7c34aaa74349b74d29693ef9