Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7725153a10a8051…

MALICIOUS

PDF

83.0 KB Created: 2021-09-22 20:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c90e69d911a143bf44f759cc08298871 SHA-1: 004e6690346ebf14395ec7f78b62e909eef7017d SHA-256: f7725153a10a8051f5bffc6e6b87583183d7d5c0a1df08726144482eebc54d88
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on distinct domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://yam-token.com/business_school/uploads/file/giveretitevibiwafafuvo.pdf In PDF document text
    • http://tksvolga.ru/userfiles/file/35106171874.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/18699425588.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/58758950561.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/46343401893.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/20213480533.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210908121014.pdfIn PDF document text
    • http://czyxchem.com/upload/files/daxanixurizekaxaxenotej.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/zotogawisa.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/kojopoferid.pdfIn PDF document text
    • http://cosyromania.com/media/file/vaxezus.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614aeef664d12---kukewudefu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa2d0bf702---7774464637.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/63113465476.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/sesurowuxotuvinipaluwumu.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/25683700032.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/19489960213.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/99437578433.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/69664615907.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/zapur.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/30867173746.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-13-11-04-10-94.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ardaas+karaan+songPDF 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_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 20800 bytes
SHA-256: b8e7200c6f186bbff4c4566c58050c5c3b6b243c96fa2b408c48256f91906311
font_01_sfnt_off0001102e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12845 10128 bytes
SHA-256: 53adcdd8e864c3f9209ef425ef15a6bac1cbce0b530119c476f78ebb3051a6e6

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