Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f0ce7058982568…

MALICIOUS

PDF

76.7 KB Created: 2021-09-08 16:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e978994e66e03f4e4ba71420782c9537 SHA-1: 3a5f41ab2850335f7ddc3e03449283c9f0e01f34 SHA-256: a7f0ce7058982568e91b8fb232a0100339669d582eecd441be69141860a3294c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the embedded links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=pcb+connector+types+pdf PDF link annotation
    • http://location-appartement-venise.com/italie_documents/files/40818453365.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/wubabo.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/zineb.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132a5e6f3c2c---83867296050.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/kizeka.pdfIn PDF document text
    • http://moretonassets.net/userfiles/758250874.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/tumuwesajudojajeweroj.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/vuzisibibosopirakufela.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/jikukobas.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/lagizawetodenevivumonuset.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/rulezuwudajitawi.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/mozotezu.pdfIn PDF document text
    • http://bptramptour.pl/files/file/depegujafezok.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/9933598067.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/32493977320.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/pojeloxadazi.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/ravunuwosijurob.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/dexikutegifezuzefanuv.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/pogakeni.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/mutifizizirubipisamukofup.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fac4c23696---wumubisodijudafexob.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/xojojuxal.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/8493803072.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/vujagamelozonedokogidipog.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_off0000c99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99D 16768 bytes
SHA-256: a48c673a58d71e939b0d5ec42f5f3b5df87962146d3a5eebbbba61eb1cc48089
font_01_sfnt_off0000f4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D3 10568 bytes
SHA-256: 66f484226e4b23f662ee243daa9f56022ea595a14f3e4d9374b26913662a64cb
font_02_sfnt_off00010ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1