Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e1230e05ce80be…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 14:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ea8ea570c80b8e66e7187d0b95f4323 SHA-1: f63cb24850a2365e7bc7bea698036568ee66b61b SHA-256: f9e1230e05ce80be0f0c6b5667761586e85455238e65e3e8f31f13d4467f2842
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a large number of links pointing to disposable hosting, further supporting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=co+op+puzzle+games+android PDF link annotation
    • http://joesservicecenternj.com/userfiles/files/demizuzezudapov.pdfIn PDF document text
    • http://presupuestos.pavysan-bigmat.es/ckfinder/userfiles/files/fotosawaxutalubilinapuwaw.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/rogomuxiwipiloxaxezuzujuv.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/sapupukujogikebip.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/92848c9b407f117e1f0b19787c6023a4/92901622426.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16142d70d5de3c---87556741903.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/79887951614.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/29019220852.pdfIn PDF document text
    • http://mosjob.ru/images/file/16090517571.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/22409024817.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/fabeziminasesig.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/68248395839.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/sosodoboz.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/31894133736.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/metoweriju.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/sajobemotepaf.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/masikaluvenojorovobu.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/89578756131.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355b473f3fb---73777003694.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/79992706505.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/54068908879.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/nafogirup.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_off0000d57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57D 10828 bytes
SHA-256: fdb49c0d1adc22b786d891351676692539ff707bc940c1203e7c75f369b3d843
font_01_sfnt_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 16388 bytes
SHA-256: b33d0a5815213555a78b60fcfe8ed316b236bab9a5e15189638b64239fc00a56