Malicious PDF — malware analysis report

Static analysis result for SHA-256 3446f19589a6ffda…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 14:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc96f1150a85df688ca42bdf9b1ac6d4 SHA-1: 31a03d953115d0010fdee149401c13eb9cc6f7ac SHA-256: 3446f19589a6ffda95e2301978f54f3009a808988540f7be0f4d40220c538ae6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, likely designed to redirect users to malicious sites or downloads. The presence of 'utm_term=vmos+download+apk' in one URL suggests a lure for downloading an Android application package.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://1666-3668.com/attach/userfiles/file/joremawilenotosusapesimaf.pdf In PDF document text
    • https://tatsolarlight.com/uploads/files/kumovolivuvapamu.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/buvox.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/11877429728.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/zufoga.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/95629630952.pdfIn PDF document text
    • http://maxbrio.kr/files/files/17130197755.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/bufuwotijopawanuwupe.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/motinibeferiret.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/togitifipuf.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuwafadegugovov.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/juvipujasisegizu.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/korufiras.pdfIn PDF document text
    • https://strechybenesov.cz/content/9089866937.pdfIn PDF document text
    • https://linardi.ru/files/file/zifosuw.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/sozukuxiluvaxekadug.pdfIn PDF document text
    • http://balone.net/_upload/file///gukusuviralegovewu.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/98473865372.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c68e929075---66038228490.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/tolawirisavidawipovasuk.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/genarusuxusigunobinatij.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/49379031925.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b0a6faf202b3269e4eae3116b2ec0d85/43474419566.pdfIn PDF document text
    • http://hidropro.hu/upload/37522950453.pdfIn PDF document text
    • http://acelybio.com/upload/files/zesalejuxariz.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/remopebimoxiwotugim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=vmos+download+apkPDF 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_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 10276 bytes
SHA-256: 3071ca5ee367f2fb9186573eae60f2bfaa8013547afe2d9555334b878a227957
font_01_sfnt_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 17868 bytes
SHA-256: f55184494caa1502b68d5086c379ab4a62f4264742a791819bb7f71c1b2ddccc
font_02_sfnt_off00011cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1