Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea312538baee229…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 10:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 904eb40ce9fe58ce13487a21a54b2759 SHA-1: 264f31c347f54682acf99d9f69bf993e14c82186 SHA-256: 7ea312538baee229d3382068576767a037eb3006efd2f5bb04ec0e3b4444f277
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis indicates the PDF acts as a link farm, directing users to numerous other PDF files hosted on various domains. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it is designed to lead users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://ubestsports.com/imager/files/20210911084248.pdf In PDF document text
    • http://diskacme.dk/images/upload/file/18823307304.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/tejobif.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/76530947297.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/vupofenubakujivijon.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/mawizutofukegajozinowuge.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/59635348939.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/zotozalusivuvabu.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/xokajovogetitogijamemo.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35bacdfea---90609442687.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/wunixukutiwag.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/29121677768.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/wazevipuzunude.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/47811273357.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/direzagusowapejagipanus.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/sodarajigefinibumikuvop.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/47175431339.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/wutuxezogitoduvofe.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/jepusobopitikubebekogeg.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/31117980970.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/gagogewulelaxekilufub.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/45275644285.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/wozelevifazigepire.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/44540872581.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/nelexem.pdfIn PDF document text
    • http://buddhavihara.net/userfiles/file/xukozedusomilunegatin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=add+photo+to+home+screen+androidPDF 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_off0000b257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB257 16340 bytes
SHA-256: 927c0fb447e3b64f5be9b8bb0bdffca9e9d95e2f7f946f83ed04ec928fd5d941
font_01_sfnt_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 10716 bytes
SHA-256: 2a64e62af12e03016422991ffa5a1db199e22c24e9fc99078307cea58b02aead
font_02_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1