Malicious PDF — malware analysis report

Static analysis result for SHA-256 592641fad6360418…

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 01:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6fdb6ba53a00558f4d909e259a6e4a84 SHA-1: f85bad45bb5322dccff7f8c8774aa6af22fdddf7 SHA-256: 592641fad6360418d6c6588b28de298f951f1104d307a7fbb7ca75a1ed358824
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and heuristics suggest the PDF is designed to redirect users to a network of potentially malicious sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/zurifodelobavotidoxajifu.pdf In PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/65284180780.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/jovarujifavuwesaza.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/31846619433.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/15383734944.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/zagexumegubebere.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/7083128496.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/razupedurip.pdfIn PDF document text
    • http://only-svet.ru/upload/files/wamifif.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/lunowixelugov.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/rodubaruto.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/22277173437.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/98016897286.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7a7dd5e7c5af8f534840a7eeff6c9d6e/winagaxeneme.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210917195809.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/96720155678.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/ruxobezolanejew.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/13654423621.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/6598237582.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/fugotuledoxafo.pdfIn PDF document text
    • http://mlight.cz/archiv/file/kuxidubedoxi.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091220494980554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+change+phone+number+on+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_off0000d07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07E 11064 bytes
SHA-256: 46277dc73131cd906c77e631719a49bdc2db8c0056b4a73bcda80aecfb2c37e2
font_01_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B3 18096 bytes
SHA-256: 0813c9200e2cad6f43f62aa05b522cfd388489aaa350ce148461ff8c1cd35434

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