Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8fd9ad8418d485…

MALICIOUS

PDF

77.9 KB Created: 2021-09-21 01:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7e8d306f607d30cbbcbc1519ef9a4ea0 SHA-1: e70a7e0cff99db2c991eed2bd6adce5eab4e8a99 SHA-256: da8fd9ad8418d485bb60f4c7e0b724f552587bbbcb19243bf03449a0d6cf8be8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://parisnordmedical.fr/docs/file/56538308624.pdf In PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/fizesirarimon.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/11215816825.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/guxufofopofipaw.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/sekogovexibirotunuto.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210905045414.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/98053118331.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/76925903480.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/79806417212.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16149079d48606---wakozixakapopitemadud.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/nefifamagipabe.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/19436481887.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/nijexowotatajipiz.pdfIn PDF document text
    • http://asustainable.com/global/file/genig.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/78968287480.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b55c459124---gumiwoxujagoforiwuna.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/zetuz.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/ridukufawidadisagadapigi.pdfIn PDF document text
    • https://duvanco.be/docs/files/kudurifodaxibobukonuxamo.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/pisulofekifuxig.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/sumefobo.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/50835888847.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/61566867639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hotspot+issue+in+iphonePDF 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_off0000cec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC5 10132 bytes
SHA-256: 588a26468c79a0482c0fe8c5b559fa0f8c622721e0ef040cf326dc05b48dc620
font_01_sfnt_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 17632 bytes
SHA-256: e7c11138f6797e7f891374858fc818389eb2daeb59b2434a9066a6a5a53f84f9