Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b23d163f7f4b5e7…

MALICIOUS

PDF

72.5 KB Created: 2021-03-28 01:19:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e95e5c5e77b358a89818de45585cf9bf SHA-1: f876fafdcec74067e1387d80a432f9c39d6f5727 SHA-256: 8b23d163f7f4b5e77fc57c65d7b48d97ad64433fb1ab20208ed71a8717002abe
66 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics strongly indicate malicious intent. The document contains numerous embedded URLs, with at least one pointing to a suspicious domain ('soxebez.ru') that is likely used for phishing or malware distribution. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/123?utm_term=baby+pic+hd++cute+good+morning PDF link annotation
    • http://e-devletturkiyeaidatsistemimgovtr.com/solamente_tu_pablo_alborann02qq.pdfIn PDF document text
    • http://juvugewit.iblogger.org/que_es_escepticismo.pdfIn PDF document text
    • http://hook-up.fun/what_is_callus_remover_meaning175di.pdfIn PDF document text
    • http://lbaranaydin.com/star_wars_books_chronological_order_listlsjrn.pdfIn PDF document text
    • http://saratov.ooo/suzuki_piano_vol_1_mp3kz3t3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f641080-bad3-439e-bfaf-0198ccb48427/81574435476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cddafd37-060d-43b9-9a8f-a752c138875b/how_to_update_ipad_user_guide.pdfIn PDF document text
    • http://vuwadiwotaja.rf.gd/eats_shoots_and_leaves_reading_answers.pdfIn PDF document text
    • http://vogopulototav.epizy.com/66157271217.pdfIn PDF document text
    • http://winenezufu.epizy.com/5544097813.pdfIn PDF document text
    • http://lamafuravufezin.epizy.com/cargadores_solares_para_celular.pdfIn PDF document text
    • http://kadorekamik.rf.gd/connecteurs_logiques_traduction_anglais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b802a742-1867-463d-8828-3aeacf7bc20d/how_to_manually_drag_items_in_pivot_table_to_sort.pdfIn PDF document text
    • http://mezoninol.epizy.com/backtracking_line_search.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a495ae-f5a7-44dc-ad7b-bf390b1013be/steelheart_brandon_sanderson_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/690dbb00-832b-4808-981a-c15e10f0e59f/verizon_fios_volume_remote_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1916e493-bcdd-4462-b18c-3a7e94624bd0/17061947057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee33069b-2e1e-42ed-ab6e-033eb3a00b31/huckleberry_finn_book_sparknotes.pdfIn 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_off0000dde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 5568 bytes
SHA-256: 5e4b543e36b4ff0f1ded6be6033a42eda80551d96c4eee61db441815a2a6f103
font_01_sfnt_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 10636 bytes
SHA-256: d5f0d5be4ee399b3b6e2dceb3a37c9137f8fe0f5a166e70f1ca78dd739b15b32

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