Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d745f099fefa4d…

MALICIOUS

PDF

71.0 KB Created: 2021-10-07 05:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 001aaf51d3cb27a218e9e5b7d593a662 SHA-1: 75e74f3cbdc2b5d925e9b0a43f6a65b12082f249 SHA-256: 05d745f099fefa4d41fb0febc66f5ec2485ec58a40805e1231dc2807a5964001
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest an attempt to redirect users to potentially harmful content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://knowleangling.co.uk/ckfinder/userfiles/files/44503000407.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e91033a1f0---xenebemavubevejalem.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/dufobabavetowawa.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/36595341969.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/radetelim.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/wovapibitevopunew.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/vigomepixobipigisij.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/cbeaa795c762c509c41381314f4115d2/kupoxametoxevaze.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/jubedesafuxexowakivir.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/92772965293.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/70341754747.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/38538658018.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/tuxipidisizewo.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/16306832932Sw6.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/84326025899.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/pubawakulepitepulosaj.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/80678371909.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/pedibuwaxeloz.pdfIn PDF document text
    • http://stl-hk.net/userfiles/61853564127.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/kijejidegujenolug.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/nubavuxexa.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/63645971405.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/fuxamalubufinupotime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sandese+aate+hai+song+download+djPDF 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_off0000b403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1A 10720 bytes
SHA-256: 172cf5d8fade83f6a6402eea0baf80c7fcdf689ae5fd1f55457c11dbd5b185d0
font_02_sfnt_off0000e469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 16584 bytes
SHA-256: dc435841eefa7fa851959a8c0acdd60450ccba59040ec9f04318544eb277c85b

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