Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a39d1f5ff92287…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 23:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fab2ed2ce63a59ccd3871d02cb07dfcc SHA-1: d31b527c6e841ffce478f03dc816d5a9a06a8b1a SHA-256: 44a39d1f5ff922876d860b205472702456a4a1f159bc483feab90660fff88fbf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://ketchas.ru/uplcv?utm_term=watch+prince+of+persia+online PDF link annotation
    • https://pomtco.com/technical/files/file/98449990925.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/vezawevemeduvifup.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/97042156595.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/34597440461.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/46210980414.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/roxatulokovolo.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210912045405.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/56331057535.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/77969663956.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/najukimazomonu.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/kamirotoxanoxila.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/36946969537.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/40016543244.pdfIn PDF document text
    • https://greenlakecruises.com/ckfinder/userfiles/files/wunumifadafalot.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/vesisep.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/75224912846.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/58495828851.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/sotij.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/89653593569.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/muleketesabezivavuwaz.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e74627ca0---mutelefemevogoluvijoxapud.pdfIn PDF document text
    • http://safarang.com/basefile/files/7706774150.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/50290912119.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/xulatavenesizowal.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/95188409226.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9afba4b9ce28574a17bec6b1de05c24c/laparakavoboji.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_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 17880 bytes
SHA-256: 79660463c56efedc1bb1fab1c736e45b8f7ad9b38a9cb87d33bd163535ba2284
font_02_sfnt_off00012203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12203 10572 bytes
SHA-256: 6128e69b229ac1c95f031ae955cacda71531352cf9bdd6d6c92ffe7c90a1dfc5