Malicious PDF — malware analysis report

Static analysis result for SHA-256 17db1780b3ec0303…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 05:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 074cb85fa688c60085cddf7b4753ea9e SHA-1: acf4ba2e8dfb59922969388e358fa01e3dca145e SHA-256: 17db1780b3ec030345757a265aa15a39cc2de167cc92bfea8fd4f9603c5226a0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest an attempt to direct users to potentially malicious external sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://muzeumkonstancina.pl/attachments/file/6826557510.pdf In PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/tebuj.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/juwisobadelenoj.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/jebabuze.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3b52c0762---71320254973.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/6494807359.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/rurinemivofip.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51089957610.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/34194599109.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210903_27990E9F28CE83B8.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/keduravadajiveju.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/vitafan.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/48067889167.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/21560891866.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a7bf2e8b04e235289f5294a58fe0cd7f/lunuvuku.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/44481000900.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/85679449992.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/vepofamilitusebexuvumelo.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/masarugojenobizi.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://pnmanagementsolutions.in/uploads/fiwaninawalumomunozexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=minecraft+pe+dragon+addonPDF 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_off0000d3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 17500 bytes
SHA-256: 1944585bfc9a7838f5cf7781102adf6744695f84b9b3c1d26a60ff29c902025d
font_02_sfnt_off000118c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C7 10572 bytes
SHA-256: 21eaeee5319fda5a6517a5cb7cfa461e2427b852b0157ca11f388a4b50a591e1

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