Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bcdfb78579a0c4…

MALICIOUS

PDF

75.0 KB Created: 2021-03-15 18:27:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f2c0061dc3dd0f89adaa60cd205beb8 SHA-1: bbde1a62b6e4ab6f1cec8b1eea52ede10c082864 SHA-256: 45bcdfb78579a0c4b9de12b7929f9633dbe5b2afd35d4a2ecffeb29e2eed9083
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of external links, identified as a PDF link farm. The primary external URI points to a URL that appears to be part of a link farm designed to manipulate search engine results. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document's purpose is to redirect users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=how+do+waves+affect+the+coast
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/sotaxenoridigufilu.pdf
    • https://cdn.sqhk.co/nekuripafi/figGmjc/best9._app_top_nine_photos_year_in_review.pdf
    • https://sosakenokez.weebly.com/uploads/1/3/4/4/134445245/fb59c979bc7.pdf
    • https://cdn.sqhk.co/gigatakel/gf0bjiI/59527960033.pdf
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/670287.pdf
    • https://cdn.sqhk.co/fuwasokeg/hjbidjf/femiporupazen.pdf
    • https://xavilisepu.weebly.com/uploads/1/3/4/2/134235747/fefanigis.pdf
    • https://cdn.sqhk.co/wifopuzuxiba/ibhb7L7/92022252179.pdf
    • https://pumutetigowon.weebly.com/uploads/1/3/4/6/134699291/0a61b441f1f962e.pdf
    • https://cdn.sqhk.co/pagozixupezi/jhhm3hh/14208284280.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7f2e3162-20b6-46eb-a26a-a508ab1a7408/difexivo.pdf
    • https://uploads.strikinglycdn.com/files/34bed2b0-43fa-46fc-8934-b17d4e4c7689/midea_pressure_cooker_my-12ls605a.pdf
    • https://uploads.strikinglycdn.com/files/cdb515f7-9a9b-4ec0-ba7b-314aaddfc65e/2011_jeep_grand_cherokee_overland_maintenance_schedule.pdf
    • https://uploads.strikinglycdn.com/files/95929529-a23d-47aa-927e-bdb472eb80e2/91277953677.pdf
    • https://uploads.strikinglycdn.com/files/4d894310-0846-4881-bf5d-93e3a10c2ef7/52312984018.pdf
    • https://uploads.strikinglycdn.com/files/b937ab5f-93b0-460e-8345-8566ceabe01b/how_to_change_a_white_rodgers_thermostat_battery.pdf
    • https://uploads.strikinglycdn.com/files/5b5abd27-bbef-4713-b049-2f2dfc9aa688/jaxevifumedipodavigifibuk.pdf
    • https://uploads.strikinglycdn.com/files/7913f4f8-a4ba-43af-96fd-f97662d9a211/cavaliere_range_hood_control_panel_replacement.pdf
    • https://uploads.strikinglycdn.com/files/1984a904-996e-4167-8b00-babf96f27513/sabod.pdf
    • https://uploads.strikinglycdn.com/files/6098a7bd-ae0a-4d16-b9f3-98ff7b44b383/bejokonufozuxazuduzejuse.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_off0000e855.bin
0916a5a8b781fafe4097c73db84ed9d6bc66371c77e0ffc8f96c59d558224014		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 5096 bytes
font_01_sfnt_off0000f9c6.bin
23acf996196c875f7d4424080a43bdac6979b74a76bc56d3e7e9f355ca55bf2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 10864 bytes

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