Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a500c9c49abd041…

MALICIOUS

PDF

76.6 KB Created: 2021-09-26 01:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a4e24fe752c237313302db990482d97 SHA-1: 2bc8a1f19f59a9e738d3320ce73962182e7306cc SHA-256: 8a500c9c49abd041e64ac44daa5b9af8d90ca68476075bf3b39d69a2803a8ba0
66 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, many of which appear to be disposable and used for hosting other PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of this being a link farm designed to distribute malicious content or phish users. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 4

  • 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://sourceandsecure.com/uploads/userfiles/file/92518694216.pdf In PDF document text
    • http://pm-ural.com/uploads/files/67608938106.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/80901332036.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614005e38cd6c---15137810474.pdfIn PDF document text
    • http://wenxuezj.com/images/File/xofotalifaxasudinisex.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/85220525002.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/pisovo.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/91203886504.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/56879693380.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/22763229542.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/kosixixerofe.pdfIn PDF document text
    • http://whatdwellswithin.com/file/judanose.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/movomigetal.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/20073555291.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497b2a07db1---74978911649.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/kagozudabodimobul.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/25998974422.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/xifusuxafidofoxedubax.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/puniworotina.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/87792910522.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/34193053047.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/zosulufevakoniwewuwexoluz.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/48768197764.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/25190932034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=50mb+download+pokemon+best+ever+game+for+androidPDF 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_off0000bfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDB 18444 bytes
SHA-256: 2b56e1f5d5d2a413b89b4369093a80c7e8eee546030b1a09aa887c3b51cb32d4
font_01_sfnt_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 11384 bytes
SHA-256: 39245f081ae0d005fe0c1e600f0fb414cf4793a30a7efe329df4586d16cf7485
font_02_sfnt_off000109eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1