Malicious PDF — malware analysis report

Static analysis result for SHA-256 5908b783e5216402…

MALICIOUS

PDF

64.9 KB Created: 2021-09-19 23:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: dc8a50782da8f13a8f20c6c7c57acea2 SHA-1: 91c8379362a699cef736239f370dd96e666a3a0a SHA-256: 5908b783e52164024fdbefd1a9d009f3f882158ce0b6f0999c9747634a0beb95
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to disposable domains, a common tactic for distributing malware or conducting phishing campaigns. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a high likelihood of malicious intent. The ML classifier also strongly suggests maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8362

Heuristics 3

  • 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
  • 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://allytemp.ru/uplcv?utm_term=slow+android+phone+reasons PDF link annotation
    • http://sinners-party.de/media/file/gijodurazufijukuminafoxap.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/34931778388.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/71427762533.pdfIn PDF document text
    • http://trivio.it/userfiles/files/6366124212.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/wudonevetuzivarunuma.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/xusaraxi.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/ratenolutogegijirifug.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/guwuwuwatumudamelikigise.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/fowof.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210908051024_me3its.pdfIn PDF document text
    • https://khanikango.in/file/71614483461.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/25581977909.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/davegapakofaboxozas.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141d1a629c9d---najaxezubeg.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/xefajufir.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/xavaburalusepozibawilek.pdfIn PDF document text
    • http://minerva-collection.net/files/files/fepem.pdfIn PDF document text
    • https://maturana.cl/upload/file/xopuzi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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