Malicious PDF — malware analysis report

Static analysis result for SHA-256 125e2e3f9fd8f80a…

MALICIOUS

PDF

62.0 KB Created: 2021-09-18 19:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a75c38c10da080f5a081d8a71d54393d SHA-1: 5c1a5c35691685745f763fc08d3d42a8c0deb597 SHA-256: 125e2e3f9fd8f80a07685bb855a2741fcf901e9c267d39fb9b1757f69692f3b3
172 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded JavaScript and numerous links to external websites. Several heuristics indicate malicious intent, including PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM, suggesting the document is designed to redirect users to potentially harmful sites. The embedded JavaScript and the nature of the URLs point towards an attempt to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7892

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://crewmak.ru/uplcv?utm_term=how+to+control+phone+via+pc PDF link annotation
    • https://elsa-daulte.com/ckfinder/userfiles/files/pukosomer.pdfIn PDF document text
    • http://ossokahve.com/upload/file/kugugopeterobajagezej.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/poranaxigupunigitapux.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/vuxorere.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/walaxam.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/87568000799.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/zabapifoga.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/32268418776.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/14977299506.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd1aa83210---fiseze.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/figakijokibu.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/76461530920.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/br5gqe0h956m10jthpkt9a1bc6/wewakeg.pdfIn PDF document text
    • http://premo.at/userfiles/file/76201065175.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/24469935180.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/gizalifekejupopikurifor.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/13003569823.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/gefosejasoxokawi.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/20857871718.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/56996091080.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/tugorejove.pdfIn PDF document text
    • 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_off0000d42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42C 10448 bytes
SHA-256: edf7e2b6a037f319a67ec7dedf41e22179ecc73d98c82d03ffb1c1a2d8217645

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