Malicious PDF — malware analysis report

Static analysis result for SHA-256 5474c6f3d08c3546…

MALICIOUS

PDF

115.8 KB Created: 2021-09-13 17:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b0373c94b9fd6423822b2cb0bcf29eec SHA-1: e5e1d62d763a0812feff1e817adbbd0e9d24c66f SHA-256: 5474c6f3d08c35463a41cda2de1bc0a6d31e4761c771c6d5965c59fe91b119f8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed to obscure the true malicious destination. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=the+walking+dead+season+9+full+episode PDF link annotation
    • http://seoulmenu.com/uploads/files/faraminob.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/51814553387.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/95126776516.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/diruwe.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/zobejufopolixilajobusor.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/6296948905.pdfIn PDF document text
    • http://sieuthibds.net/images/files/16719179499.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/54919992840.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/76024682179.pdfIn PDF document text
    • https://signika.pl/Upload/file/viwukovawijonetokixubad.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/didubuvugebometafa.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/besikajilokuza.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ce0f94fd4---91447251295.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/39621975053.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/5942679207.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/rowefawafusegirozaderaz.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/59682560118.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/mumevopesegedeleg.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/ludexujixutugusunibu.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/94580970408.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/gerasate.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109092141586104.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/38979205965.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_off00015c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17488 19328 bytes
SHA-256: a22021f57db65d73fdf269248d62c173047bad8a6b4ae3ff016416463550ffcf
font_02_sfnt_off0001a753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A753 10988 bytes
SHA-256: 684b266721877ce1b14bb6213cef2006675ca7de0ec65d78632caa75171d2be9

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