Malicious PDF — malware analysis report

Static analysis result for SHA-256 420481e40262bfa1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 16:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: d4d8544d1961441e590d3b77f857abf6 SHA-1: f4119771477637cc46a9af506c43a833f0c549da SHA-256: 420481e40262bfa13e631fe4a16af446d8b4605e55409628881533f9bfea8990
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with a critical heuristic indicating it's a Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially malicious websites. The PDF structure and numerous links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wupaojichangjia.com/d/files/pajubutaxisomu.pdf In PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613470ac1726f---tuporafidowibaxufadu.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/tabakuwuz.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/lewovoxoxibovaweta.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/83847839183.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/41620436452.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/5813640444.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/733567900.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/2422938969.pdfIn PDF document text
    • http://www.bash.cl/media/file/pifixamiso.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/35174193505.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/vulad.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/rowogoxafirewemuli.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/38267756747.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/vatodufepusenexib.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/25071306368.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/66340770972.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/demorepej.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/xenefogotiziwododip.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/riwowomejubolerog.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/fedijagujukebosudedat.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/zuxufumuturalatenina.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/redudoguvozaxorijejag.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gubum.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109080349433668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=note+3+latest+android+versionPDF 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_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 10456 bytes
SHA-256: 553929f5037dced6b3421e9749e80ce1f06e799616a7ca0313561326a0a13ae9
font_02_sfnt_off000109d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D3 16780 bytes
SHA-256: ee497f34b36b24bc2446eee5e27e9aed979668aa8f60910fe3d993b03940ac7a