Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2acac5457b9c64b…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 04:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7258359a312e52006998c7d361c7f502 SHA-1: d04f1f3c6bf1b8edae6ba5e0ba5c456b9dcecf82 SHA-256: e2acac5457b9c64b7895c81efc64c9c3bfd6f53239afdca6473e9ae77117f099
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains heuristics indicating it is a link farm designed to redirect users to external sites, with one URL pointing to a potential payload. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs the user to copy content into a shell, which is a common technique for executing downloaded malware. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=install+android+apps+on+windows+phone+10 PDF link annotation
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/puxixat.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/waxuwefamanelasune.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/46823554296.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/42487549076.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/9751026164.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/wigerine.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/95185881215.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/4560276531.pdfIn PDF document text
    • http://liyangah.com/Upload/file/56298007158.pdfIn PDF document text
    • https://faceless.me/userfiles/files/zidesogakexowadunusi.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109151108479538.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/49196741623.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/40560180428.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210915_1C640014A9938A72.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/80419060675.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/jaxuxetokizovumojufizop.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130209bed087---munegakafevenadu.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/60355656415.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/95411828705.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/rubonuma.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/53798490329.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/79087624981.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/63791418368.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/dumosi.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a01e99ab53ca592c47dea745be9ed5e4/83883267427.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_off0000e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 19444 bytes
SHA-256: 4c7bd4683700b204c52727038810433be4e12192e6d284c1a6d7c3c07bfae2ba
font_02_sfnt_off00013315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13315 10700 bytes
SHA-256: 3b445a4ee7f2b98756d5914f8ffce2d6bd51f42781662a03529cdaacb1176acc