Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde735ca4d653a08…

MALICIOUS

PDF

86.0 KB Created: 2021-09-11 07:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb509b1a03094f4c2d98c34c0f798fee SHA-1: 0580a913e52d7d4188858d85439e20c573e9c297 SHA-256: bde735ca4d653a088a650e571ef1a61dbded002bbcc29a0610a71b57bf818729
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially disposable domains, suggesting an attempt to distribute malicious content or phish for information. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://shmgec.com/Uploadfiles/files/84480993325.pdf In PDF document text
    • https://cargotavio.ru/files/file/2869241326.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/64634150813.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/xatanar.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/bugizuwoganevegar.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/18473501771.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/pukurobakilos.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/vugobawifa.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/gifigeburenega.pdfIn PDF document text
    • https://interconformity.ro/images/file/baxoluke.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/niwid.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/fugekoguponufedisur.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/nutad.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/52074898485.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/pesutu.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/70100353998.pdfIn PDF document text
    • http://mousike.it/img_ins/files/45983193342.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/ribupanipo.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/59825825106.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/rubomaxaxinativefufudusaz.pdfIn PDF document text
    • http://caythuocnam.org/images/files/20023991289.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/18725250748.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/14953664491.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/89388703952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=free+watch+faces+for+wear+osPDF 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_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 10252 bytes
SHA-256: 22fbb7d4c0e8043ef2f31a9f49b43ef03f52670f2a8bfb1ac7b4af6323f6455f
font_02_sfnt_off000119ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FF 18660 bytes
SHA-256: c240dd54ace86e10c1e4eb8cbaac68bfb3fe1637935c92654c1d58ca95c32298

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