Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6752b7c6937d963…

MALICIOUS

PDF

75.6 KB Created: 2021-09-09 07:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ca81987d20a990494dc87547e29c3bc SHA-1: bf0e965930068873aad21a0b1e474e4f1df2ae6b SHA-256: c6752b7c6937d963845fcd917e2348575ee9c768dea42c7344efa1f205304bb7
134 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of embedded JavaScript and numerous external URIs, many pointing to PDF files on unknown domains, suggests an attempt to redirect users or download additional malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of using disposable hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://tortugafilms.ca/adminfiles/file/buvolepurox.pdf In PDF document text
    • http://piotrkowska77.pl/zdjeciafile/tajoxanofufajabefukat.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/xojuzakedogo.pdfIn PDF document text
    • http://www.siposferenc.hu/html/10233620287.pdfIn PDF document text
    • http://373113.linker.tw/files/dajuxarisefelijonexe.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/mr79h2um1ofophso7rvma5iclk/54758050190.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/gomumi.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/1888192041.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/faguki.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/48355978025.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///87808312282.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/supibawub.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/32712319692.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109090800208163.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/66067774162.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2be1387e---vajun.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210907223304_fl63yf.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/85569279270.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/87230013405.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/17559623761.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/82964895304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=private+instagram+web+viewer+profile+viewer+by+instagramPDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/43592431704.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_off0000b866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07D 11108 bytes
SHA-256: 2be50babc675fb906c9ca3e54ae48c2252c9aeac34898acb74b5c742179083e7
font_02_sfnt_off0000ea3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 20652 bytes
SHA-256: f816944a6e5100fb7ca067cc29a5938fdb29db324063bf57caa565882ec1385c

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