Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5588bd272b7611…

MALICIOUS

PDF

92.9 KB Created: 2021-10-08 17:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 06faea7293e9f7a0fde162fa87a393c0 SHA-1: 444a392630ee1866afd37ccffd36aea2ab80cb36 SHA-256: 1f5588bd272b761113a4e26d3d5ad9423220a4e2a40bd57be9f47f1e4eac8b16
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, with a critical ClamAV detection indicating it is a phishing trojan. One URI points directly to a raw IP address, suggesting it hosts a malicious payload. The ML classifier also strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the download or execution of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/15858857166.pdf In PDF document text
    • http://leadingedgecorporate.com/user_images/file/rujajos.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/sitomejis.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/72687189097.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/rurojikun.pdfPDF link annotation
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/nuvigipekotepelogi.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/saluvonebofoxalo.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/vutisozezubasoxemobevisem.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/aa1e5f016510faf030c78b1bd3991b58/19621476778.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/pobogozibidawuv.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/43734902088.pdfIn PDF document text
    • http://snft.ro/media/file/zokekewizakawi.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/jhilt012aorebhkicg8mvubqha/wuzomijepefewidu.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/fujakotijewafa.pdfIn PDF document text
    • http://licausi.it/userfiles/files/8914762862.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/sujagezagibokobadixoluma.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/90887513393.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/65261709581.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/33590089489.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210910035928.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/zuwagatutifiseweb.pdfIn PDF document text
    • http://ed-union05.ru/files/file/91728586675.pdfIn PDF document text
    • http://cold.lt/userfiles/file/gasiwesovufidetuk.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/saximapati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=compensation+interview+questions+and+answersPDF 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_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 18148 bytes
SHA-256: c3313d6a2a8bdeb81e3503155fef0aa85cbb5a8ba86df21566a94dc254c04c0d
font_01_sfnt_off000134ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE5 10936 bytes
SHA-256: 0010147b8533c678eb4e6af3c4ca86154b5839f14e3c2a7cb2b72bfc9ca481fe