Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d37333b58a8bdf7…

MALICIOUS

PDF

79.1 KB Created: 2021-03-14 05:11:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 342a09b5a68c9bbe5b91102042b7ce87 SHA-1: 769ff3249219d5a016c64d3ff601d51c80f77f50 SHA-256: 3d37333b58a8bdf7ed0c1fd2de570da0d339c28168c6f94e80739335cfc83df5
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The ML classifier also flagged this PDF as malicious. The embedded URLs are likely used to redirect users to malicious content or further download stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=metabolismo+de+las+proteinas+en+el+embarazo+pdf
    • http://fifonugimexa.22web.org/kawudejapetufobaze.pdf
    • http://lebadatow.22web.org/terapi_asma_pada_anak.pdf
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/rowofemevutu.pdf
    • http://remontnatali.ru/the_chrysanthemums_by_john_steinbeck_literary_analysisdh676.pdf
    • http://chisto-chisto52.ru/toyota_production_system_tpsdo4uz.pdf
    • http://kawlites.online/62753712003vps36.pdf
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/gagusotidufaj.pdf
    • http://nukepaxin.iblogger.org/84587635959.pdf
    • http://zenizumalem.22web.org/jovixixalarezakibesegil.pdf
    • http://instacopyrighthelpteam.com/21912567542lfxl3.pdf
    • http://nout-prokat.website/domino_s_village_roadi51oy.pdf
    • https://kubasujile.weebly.com/uploads/1/3/0/7/130776158/rozoxumodula.pdf
    • https://foduzivanikatik.weebly.com/uploads/1/3/4/4/134492938/fikesukiresasij_mikolobefoku.pdf
    • https://febosefukeja.weebly.com/uploads/1/3/5/3/135324858/df29121e0b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tinegomawula.epizy.com/zeworefutogunug.pdf
    • http://wigazimo.epizy.com/28526508405.pdf
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_5c6659d2a0c24922a599f801d255bc84.pdf?index=true
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_41c488c17968453588e39b714addfa1a.pdf?index=true
    • http://wijetifosoxi.epizy.com/bedroom_interior_images.pdf
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_28340725e54a424da64189634d4ebad1.pdf?index=true
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_4ba9673f55df4c15be83c3fd275740eb.pdf?index=true
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_ab3fc887e2ad4978b20b3a5e2e23379d.pdf?index=true
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_4cf9a6e39945453393ecfcf630154f93.pdf?index=true
    • http://belajuba.epizy.com/anna_may_wong_performing_the_modern.pdf
    • http://gigitepusiligo.epizy.com/48562111183.pdf
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_1115c651c7424f52a16436e02b545b6d.pdf?index=true
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_6eb39afdd3a24ed8b6312ad2fc39a4d7.pdf?index=true
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_ea788549ce21414983c6b11d4022c294.pdf?index=true
    • http://xurolawewetaw.epizy.com/zetizakebukuju.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f458.bin
3fcd97f525a303d7bee3587c0c04b2cc5927b675e9cfb04a2d325db3d845a2e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 5384 bytes
font_01_sfnt_off0001069a.bin
89de8dc04e2003a9f9ed7f05ecf4d5d3c85327a443cdc32c807ea334cfb9fc46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 11508 bytes

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