Malicious PDF — malware analysis report

Static analysis result for SHA-256 898cd3659075c125…

MALICIOUS

PDF

94.2 KB Created: 2021-09-18 05:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6daa4bd12864e1f932eed7418a6cbe17 SHA-1: e7b6cfc7d1d119b5da3968b8349ece40ebcfb67a SHA-256: 898cd3659075c1257152aa3ee120fafd5714d5592848a8e028625b799226e9b3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript. This JavaScript is likely responsible for downloading and executing a secondary payload. The PDF also utilizes a link farm structure with multiple disposable hosts, suggesting an attempt to obscure the ultimate destination of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://residencecarlofelice.com/userfiles/files/pomilowepopebumorik.pdf In PDF document text
    • http://skupka54.ru/upload/m/viwasa.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161395c6cb16cf---12869387544.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/butujilenuzemibukimaduv.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/91274945934.pdfIn PDF document text
    • http://art-ball.net/files/file/23135267213.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/14360a93cd7df94f1732763d6d588e32/lizex.pdfIn PDF document text
    • http://liily.jp/upload/file/20210906200529.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/mefuregawatilujepujo.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/46847414764.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/zajadokosora.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/2284924291.pdfIn PDF document text
    • http://normel.org/files/upload/file/66672390073.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/55080254589.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210917155333.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/fiwoxipowipe.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/sugufajexa.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/13404840492.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///24719281604.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/jelogeteridiworevifiw.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/mefiwexenasisorusegi.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/93318433101.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/1779688526.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/dizenuresamap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=iconos+png+androidPDF 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_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12017 19648 bytes
SHA-256: f164a69b21aafc3786217f7dcf8336d367112556effa739fa3fa2ff8a4949971
font_02_sfnt_off000153cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153CC 10364 bytes
SHA-256: 1dc73feeeaa6cb16c286c77f703ddb38f26dfcdecd3f7a3b6b05cd447bd1c9f7

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