Malicious PDF — malware analysis report

Static analysis result for SHA-256 756ca940c01abf14…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 11:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4dbcd5e392ca679ca6ff8cd55b760cb7 SHA-1: 4ba3143881e5bb9b1411affc49539b46bf95d691 SHA-256: 756ca940c01abf14ccfef03c78de8d8d60922f736f764528db7310d0d9246cf9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it is a link farm on disposable hosting, with numerous embedded URLs pointing to PDFs on various domains. The primary malicious URL identified is http://gamboeng.com/assets/ckfinder/userfiles/files/62481780647.pdf, which is likely used to deliver a malicious payload or conduct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6611

Heuristics 4

  • 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
  • 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://gamboeng.com/assets/ckfinder/userfiles/files/62481780647.pdf In PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/fekuguweponapev.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/luzezakifijomuw.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/47183588253.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/pozenegivokovu.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/45802117243.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021916347237138.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/mitibelevemad.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210913125323.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109121512364271.pdfIn PDF document text
    • http://nemalipics.com/14997588625.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/loloxewutawevawuragubekul.pdfIn PDF document text
    • http://iknow.pl/files/file/43636333865.pdfIn PDF document text
    • http://szjg.hu/images/file/61664868937.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/rabugotomebomolozuwifo.pdfIn PDF document text
    • http://gensugroup.com/upload/files/wiluzufuwoladiko.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/60550026533.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/67667683660.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/besafunopijedibesap.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/8blnup2c1i0gqm8ru4o89979h4/newepawasozaz.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/xivavafapebipemavurod.pdfIn PDF document text
    • https://fratellifurloni.it/file/16360272992.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/78486081084.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/36f47ea6ac11087d84f0a39d87ec8450/vixodovukizofagiwesizegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bach+the+first+lessons+for+the+piano+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4B 18996 bytes
SHA-256: fe6ec0ec85e01689961e442a2a17baeeb9e5550918429ac0c7735dc5936fe0c7

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