Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2313ec217f9efe1…

MALICIOUS

PDF

72.2 KB Created: 2021-09-24 21:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0de730d9a34f62b5ea71c16b0824128e SHA-1: c06c49417f3c7da67e80dd8b42f675add81273af SHA-256: b2313ec217f9efe1ce1aba84c0fde467f11c0db49b1442eba6a95c2c2a95e782
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 presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is part of a link farm designed to distribute content, likely malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://elger.cz/fckphotos/file/xirozitilomufetusobi.pdf In PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/59720478708.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/35478136448.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/sezopokoxebofupafepopus.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/35702322990.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/22393744039.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/52628834198.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/82566186486.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/98793537824.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/38000552660.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/84b7601b6552cfdac7d811b7d96508e2/3243344590.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/xawekesowabofolurosivezap.pdfIn PDF document text
    • https://akemi.ro/hirek/file/8594517901.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614566c62fc18---firawofifumot.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/bisewivopifatox.pdfIn PDF document text
    • http://a899.net/userfiles/file/20794077437.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/9785041243.pdfIn PDF document text
    • http://toonesk.com/upload/tuzopogapifiv.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/496147225.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/terikadimuvojoza.pdfIn PDF document text
    • https://stvorki.ru/files/file/41664069593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=minecraft+download+free+chrome+osPDF 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_off0000b1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FE 18208 bytes
SHA-256: f23ae2db31b6b201729a7b090117a2c3981a24487548a749bf032f1953a6ffc1
font_02_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 10820 bytes
SHA-256: 23a2fa1acc7662bf24868b5278c7594ab11cf1ca34a29a56de1b37e00c4474b6

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