Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde3e41a205f2b9a…

MALICIOUS

PDF

69.2 KB Created: 2021-09-13 18:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a44d30fb1147ce95b1b15e5d9ef88189 SHA-1: b839321f3d158b063642e2cf95dd605d402ed76b SHA-256: dde3e41a205f2b9a3cb58e466cc9484555a403bfab4289c250c46516d7e74155
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest malicious intent through URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cupanghitam.com/contents/files/jipulikuloxupijusujen.pdf In PDF document text
    • https://aquatrustfina.com/userfiles/file/mipuxoradavijejovaliwefi.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/bejirisozonibiwit.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/figulaw.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/waxobumavivexadebakopemog.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/jesoponevi.pdfIn PDF document text
    • http://mlead.net/images/e/file/zajitux.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/21346855692.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/41452648943.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/miladajulizexomixibivemeb.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/17169670280.pdfIn PDF document text
    • http://gr-chem.com/upload/files/kekiruve.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0a208f9d---52764665246.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/rutomufowafukawalan.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/60577666346.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/xemuxowemig.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/osqiocepkg99gutvfnff9kkohn/kowozivefefafina.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210913010551.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-11/images/files/kusumanixupuxuf.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gunefofamu.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/ruguxumovajexurodesibozo.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/notab.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/23403947152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=good+gba+gamesPDF 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_off0000b378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 10328 bytes
SHA-256: 6bfb7e292e3be75ef9dffb800a2932d894f84055aa3bc5f7584d41781ae6cc93
font_02_sfnt_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 14684 bytes
SHA-256: b84b96d63183cee6f63e1cd335bffe5a31f00f67f620b675cd5c42cd979f4eb0