Malicious PDF — malware analysis report

Static analysis result for SHA-256 84cf126af985d26a…

MALICIOUS

PDF

72.2 KB Created: 2021-09-30 20:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d19e97faa543351126ccfcecf8dde5d3 SHA-1: b7c98f5b1311b6ce245589ad1a4c8de7ed0aa4da SHA-256: 84cf126af985d26a27ea25cc2e1257ffc5dcf1435c4b35b727f3d92c41d1e060
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous external URIs pointing to potentially malicious or link-farming websites. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely attempts to redirect the user or download further malicious content, contributing to the overall attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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 https://crewmak.ru/uplcv?utm_term=capitalism+the+unknown+ideal+pdf PDF link annotation
    • http://smwiarus.pl/ckfinder/userfiles/files/9534524907.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161362cfce40dd---velar.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613566a79994b---rawapofuvugeme.pdfIn PDF document text
    • http://abnicum.com/files/file/90044855101.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/zamomepiguseros.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/75913645761.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/sujidokuj.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/56562289987.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021092703202773499.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///76581537664.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/digamij.pdfIn PDF document text
    • https://kulittelor.com/contents/files/36546977384.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/89162447358.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/pimelitep.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/10273031260.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/zofogamel.pdfIn PDF document text
    • http://rinsacars.com/files/others/nuxomewidiregebaju.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/69496284840.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/besuturilegegerakudafusup.pdfIn PDF document text
    • http://epicridesnepal.com/files/dazedami.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/putomerazukakido.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/3725636682.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/rokeloluni.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/44377137887.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_off0000b4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CF 17668 bytes
SHA-256: 9903b33d75df9972ce7696863b90e9cb8c03a427ea8ff50665c50ee25f86559d
font_01_sfnt_off0000e1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 10972 bytes
SHA-256: 636a8c613e249e7f87a646c3449d24a5d9e74b856915da167da044af03245dc7

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