Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd94fe4bde424675…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 06:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2db78d399fd65b411d3e79c2d0f75747 SHA-1: 9bc37101de25ff649085d3459221a6841c70476d SHA-256: bd94fe4bde4246750562b94f72bd40d4e39a7ee5bb589d295b89e13618494629
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external URIs, including one that appears to be a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=turtles+all+the+way+down+download+free PDF link annotation
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28afe41931dcdd0ef329524adc66dc95/latedifurox.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/jefamizijawi.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/wofajavapunoliwi.pdfIn PDF document text
    • http://farmina.ru/uploads/files/wizuzidonasogumojekule.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161304c0fc7724---sozelivovi.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/2078775534.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/xopebotefaxefoju.pdfIn PDF document text
    • http://prmakeup.com/Image/files/pifodebuzulur.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/39948014997.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/59093129240.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/30279571328.pdfIn PDF document text
    • http://lovesenergy.com/file/14407382316.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/54682672026.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/98972670832.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/33942852583.pdfIn PDF document text
    • https://vontobel.shopbyeberli.ch/userfiles/files/lafimasepe.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/viraripasuxepoxutub.pdfIn PDF document text
    • http://checopharma.com/upload/files/84531647933.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/nofemuneket.pdfIn PDF document text
    • http://usateatop.com/_upload/files/wazuvoxukizikaw.pdfIn PDF document text
    • http://castel.lu/userfiles/files/33661631962.pdfIn PDF document text
    • http://freestyler.cz/img/file/wewimudimemivemanawikib.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_off0000d584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD584 18808 bytes
SHA-256: 32027a5dbc3456a6829e98dbb34185783421b153af1b973b700a583684de2729
font_01_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 10620 bytes
SHA-256: 681c835fd7b481bd5dfbcbd25545343bcbc36c23b3ddb1fa24bd756ca4dd07fb
font_02_sfnt_off00011e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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