Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6b2bb01e8d5430…

MALICIOUS

PDF

84.6 KB Created: 2021-10-12 20:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9e9997ff1fd34f50178b25ddfc519009 SHA-1: a5647847711fdf0fdd88bbf9ebae492383adb67e SHA-256: 7d6b2bb01e8d54301155ebc60a82aa45099711d3f83a3e558e51bb36bbfa59bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous external URIs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The PDF structure and embedded content suggest it is intended to trick users into visiting these malicious sites, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://dentalweek.eu/userfiles/files/94450275950.pdf In PDF document text
    • http://sin-hua.org/userfiles/37938533753.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/sewefigidapotelina.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/70654756337.pdfIn PDF document text
    • http://fohow77.ru/upload/file/53445445870.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/54727326597.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/tufagebarudatavarababiwa.pdfIn PDF document text
    • http://olapromos.com/ola/uploads/editorImagesfiles/27695534124.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/geroguwuzulikugeludetusu.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/36928424122.pdfIn PDF document text
    • http://devveb.net/userfiles/file/87363617964.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/xibaliga.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/dometijokuzeboxiw.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/36150340394.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/nadopovemoguvulogodeluz.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ba46c03f---nazovo.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/vatexewifisisufuj.pdfIn PDF document text
    • https://steammining.com/userfiles/file/kejolazawujisajewuterok.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1632411710.pdfIn PDF document text
    • http://taigesw.com/upload/files/patudurewixavazov.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/xugojinisabawuf.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/17249708174.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9892fcb778d879e53982950d4cb3f3dd/55381350443.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/Z3ufxtS7Wvw/uplcv?utm_term=voyager+1+futurePDF 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_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 20684 bytes
SHA-256: d35a5793686b03477c6232b753f72ad23b27ca4de693619b194d7ddfe305004a
font_02_sfnt_off00012dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFA 10212 bytes
SHA-256: 59e7b74b2469d50b558e59409ad3d6825413933c5e16ae1dc44046edd298d229