Malicious PDF — malware analysis report

Static analysis result for SHA-256 18624e7ce4b0eb93…

MALICIOUS

PDF

74.6 KB Created: 2021-09-21 00:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c508e69c11e18d1b787bd02e8e1989d SHA-1: d3c3a0d6c779d6f7527fdf87e08d5202dd3173d1 SHA-256: 18624e7ce4b0eb93cca8c5f825c872102cb765226bc0d1dfe8bcc8b5e058f1c1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings and extensive URL list suggest a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=cheats+for+disney+magic+kingdom PDF link annotation
    • http://xageunion.com/userfiles/file/kimigi.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/17c800e7db2302dde776b6479beee771/wokibabasaro.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/zawipilukizoxosemipus.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/56876192681.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/27616270331.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/29175740633.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/retebasipomexivuvazij.pdfIn PDF document text
    • https://heyratacademy.ir/file/rolozidi.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/1390770074.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/14285258007.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/92098485998.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/radoguwulabiwekaf.pdfIn PDF document text
    • http://soc-in.com/data/media/files/3823087939.pdfIn PDF document text
    • https://seger.cz/userfiles/file/kexidibabexuzimo.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/42524335112.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/kuwojelezozuroganisixutif.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/2532826795.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/xutawus.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/94183924297.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/mebuxiposadoziku.pdfIn PDF document text
    • https://e-midas.ro/files/file/powelefikigumudebokim.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16148fb0eb794b---jekimimet.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/vafivobakoji.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_off0000bf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 16728 bytes
SHA-256: 76a6381f64ba0ac3f042d1f26afd8e42311388346990c5ca40ade9c2e8819fde
font_02_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 11112 bytes
SHA-256: e80c0620b27917d339953fc22e910843abf3a4541b45aaeaa1b960ffbd888625