Malicious PDF — malware analysis report

Static analysis result for SHA-256 461cdebe510a378a…

MALICIOUS

PDF

71.6 KB Created: 2021-10-02 19:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c144c535479b63d3a7b0f034dbe2c9d4 SHA-1: 0be353d8605fe5499e0697b8b92d1b3e6246a2bc SHA-256: 461cdebe510a378a263f33ef0f955dc4fa303d46a2fce3a675aa986c52a40f5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to distribute links across various sites. No scripts were extracted, but the presence of external URIs and the overall detection suggest the file's purpose is to redirect users to malicious content.

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://lifesmart.lifesmart.ro/ckfinder/userfiles/files/wibebiwopenuwol.pdf In PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/bofumiwewitaluxakezepem.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/sugaxolunilomevin.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/9072857192.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/zososajorokamixupi.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/16476542709.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/6396397981.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/guvelapurulega.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/51987485682.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615817a801c25---3191449289.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/71556046218.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/jumakanebebanenuleviz.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/73300442357.pdfIn PDF document text
    • http://turnyras.lt/Files/file/fodelulositapavamavek.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/darivuranofasimivoja.pdfIn PDF document text
    • http://es-iyashinomori.net/yamituki-n/uploads/files/2673807538.pdfIn PDF document text
    • http://ametansk.ru/uploads2/wetitub.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/18642375756.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/pamaguralunimexuveduz.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/33624844863.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/toboxamuxolefa.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/nobalulogogutesugomokevek.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/52766140833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=inception+full+movie+download+720pPDF 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_off0000b4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CA 16484 bytes
SHA-256: eaa680bc940470c91169f9f866c58dccdd5e3b93646ac47ad742a2e2bf80a0f1
font_01_sfnt_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 11008 bytes
SHA-256: d32c447204c40f3d009f9fa106b20bfab7b95cd66799de4d14cbb30ca253b5a7
font_02_sfnt_off0000f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1