Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1915d827f3c819…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 07:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5cff86a2d7ffc43ab029560c3d0cf77d SHA-1: 04714f1009f73489b33d178a442f6182b78dd27c SHA-256: cf1915d827f3c819b7911b6cf1baa17a787d2cdafc24eb32643b1f1ae873124e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous external URIs pointing to disposable hosting, suggesting it's used to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript indicates an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=turbo+wpn+lite PDF link annotation
    • https://redac.ch/upload/tapafujutuxev.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/82730469584.pdfIn PDF document text
    • http://espokebar.com/uploads/files/55478327471.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/8461842470.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/zukufuxixur.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132abc505b1d---92161768068.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/6219573394.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/sevodivubo.pdfIn PDF document text
    • https://norservis.info/files/files/46188080062.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/39613137099.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/rileludozo.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/negixekatixatuju.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613442bbe453e---71071080029.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/kejupezebanavofuleseg.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/2134765673.pdfIn PDF document text
    • https://unaizahic.com/Files/files/xerufu.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/xilixugogusoludavixol.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/xelutinuxeg.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/b699d17d50ed42c4dba213bb98aad496/6324511248.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/89282805938.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/11405688039.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/49105304355.pdfIn PDF document text
    • https://eniedu.com/data/file/20210917012510.pdfIn PDF document text
    • http://imaginove.eu/data/Files/xaromime.pdfIn PDF document text
    • 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_off0000dded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDED 10204 bytes
SHA-256: d3d3cd325dd011cc1fd668528963b0397d7d3522f2ccc9c412e1fa5c72b4f9f8
font_01_sfnt_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC3 19960 bytes
SHA-256: 8186251d5e15dd81323524bb5245eeffd0d7f0c754388c05d2daa62d8c6bb6b8