Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e4e94aa44d5525…

MALICIOUS

PDF

82.4 KB Created: 2021-04-04 09:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fafae45b1d728397891749cbeda12ac8 SHA-1: 53714ffe7d0e8f1026cd2068be4f1d86da76dcf5 SHA-256: b4e4e94aa44d552540f35803f9b932adad8edd7f0b1273ef2970644a790f9382
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=cursive+writing+paragraph+pdf PDF link annotation
    • http://trikotoria.ru/3999626411iuzz6.pdfIn PDF document text
    • http://tadidavazutopa.sportsontheweb.net/59751068520.pdfIn PDF document text
    • http://hushseo.online/fupibijtwkbf.pdfIn PDF document text
    • http://jurojegame.getenjoyment.net/26505549863.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/the_shah_abbas_milani_free_download.pdfIn PDF document text
    • http://nodefiw.medianewsonline.com/cutting_board_plans.pdfIn PDF document text
    • http://megatorg.ru/tanglewood_preserve_rockville_centre_nyxey88.pdfIn PDF document text
    • https://sixisamut.weebly.com/uploads/1/3/5/3/135308299/5538151.pdfIn PDF document text
    • http://kazotapojiwi.mywebcommunity.org/ocean_park_map.pdfIn PDF document text
    • https://neweruruxoponi.weebly.com/uploads/1/3/1/4/131453136/menexuwubo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_cce6bb56786046739d6129be316ea15a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/matuk.pdfIn PDF document text
    • http://tajinugedas.epizy.com/55098114283.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_9b17eaf74367498c9fc24df161c34ee0.pdf?index=trueIn PDF document text
    • http://pederufe.epizy.com/vasetegogagewovedevowo.pdfIn PDF document text
    • http://kavaxix.rf.gd/52650921666.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/back_to_eden_gardening_youtube.pdfIn PDF document text
    • http://sawokemapixaf.epizy.com/what_is_a_scrum_and_sprint_in_agile.pdfIn PDF document text
    • http://pefoxaxogux.epizy.com/mogib.pdfIn PDF document text
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_2795049591954e7b8cb43c4171ba6426.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/20470572396.pdfIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_41aae8135f174b27a77fbc47d28ae858.pdf?index=trueIn PDF document text
    • https://beca70af-11ea-46d2-a649-d7fd44c468ee.filesusr.com/ugd/dd41e2_c257ce5f4fef43a2afc68072ba436343.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 5328 bytes
SHA-256: 33da9d1cb266fa86043ae6cf134c0cab759fac771fbc79a047bf5a14e5b93e9a
font_01_sfnt_off00011670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11670 11076 bytes
SHA-256: d9c335098ac3a8292f56e4f33e4ece8313da87b78bcd12db4422aedbcddf9caf

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