Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddde380a6a977c96…

MALICIOUS

PDF

82.3 KB Created: 2021-06-01 04:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d10f2291973139e866f3bd2ad722fbba SHA-1: 7826b91cd0da8fc3e2ba91a49353614033e0f465 SHA-256: ddde380a6a977c96550680f44cad2ffaba8dd23b976531d3d1eccdc7b0d7c064
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were explicitly extracted, the presence of external links and the phishing classification point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/pbw?utm_term=free+study+guide+for+ese+florida+certification+exam
    • https://cdn-cms.f-static.net/uploads/4465003/normal_6067d4a220a9b.pdf
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/254ea1.pdf
    • https://cdn-cms.f-static.net/uploads/4450260/normal_600b74ebd07a8.pdf
    • https://cdn-cms.f-static.net/uploads/4372378/normal_601b717b9404f.pdf
    • https://kosazuritejozu.weebly.com/uploads/1/3/0/8/130874521/bozelodozujopowiput.pdf
    • https://static.s123-cdn-static.com/uploads/4462974/normal_5feb9c43c5e97.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/55639275-741a-4137-939b-a9f7b636875a/what_age_can_a_boy_join_cub_scouts.pdf
    • https://uploads.strikinglycdn.com/files/caf7b38e-e1a8-4c9d-9633-d2e185a900bd/445956200.pdf
    • https://uploads.strikinglycdn.com/files/2f26d58e-960e-4ba3-b7b8-f0c4c8f3b3c6/53441764853.pdf
    • https://uploads.strikinglycdn.com/files/093aba94-c552-4673-9e31-aadbf87e7ebc/36100233558.pdf
    • https://uploads.strikinglycdn.com/files/dc753a5d-5914-443f-b09b-110748f40c3e/can_we_transfer_whatsapp_from_android_to_iphone_via_backup.pdf
    • https://uploads.strikinglycdn.com/files/ce61a755-0d02-4974-98f4-48bb1b79a8c7/maiden_voyage_sentence_in_english.pdf
    • https://uploads.strikinglycdn.com/files/34943528-46fe-45e7-a69d-419fb16b67b0/tejugokenamujuxijamezu.pdf
    • https://uploads.strikinglycdn.com/files/db8325ab-8008-4dbf-b6cf-a0ae8c8742d4/free_audio_books_on_electrical_engineering.pdf
    • https://uploads.strikinglycdn.com/files/e316f057-7475-4c1f-91be-6ebd3f619798/how_to_clean_filter_on_dyson_dc35.pdf
    • https://uploads.strikinglycdn.com/files/7ff152f6-b339-4fd9-9b07-0e4ebeb17d25/how_do_i_reset_my_doro_7050.pdf
    • https://uploads.strikinglycdn.com/files/6bff8802-2bd7-4345-943e-43a8226da731/staying_alive_in_year_5_book_review.pdf
    • https://uploads.strikinglycdn.com/files/8159fe64-fc0b-4d67-868c-b5296c37fcd8/75065373860.pdf
    • https://uploads.strikinglycdn.com/files/5f8cad9c-3d11-4921-aad0-212176ad48b1/samsung_55_inch_tv_4k_uhd_led_lcd.pdf
    • https://uploads.strikinglycdn.com/files/8a3cb44c-1f2f-4412-9a11-a6cd21dba776/dekibibuketojux.pdf
    • https://uploads.strikinglycdn.com/files/02801b32-8daf-4fad-ba70-c65ce132356e/fenixotuzudasal.pdf
    • https://uploads.strikinglycdn.com/files/d181c1dd-cc93-463b-b7e4-400e57d546be/96308506255.pdf
    • https://uploads.strikinglycdn.com/files/f4bbf4c3-2e04-454c-bce9-44aa8a283707/how_to_unjam_a_swingline_heavy_duty_stapler.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_off0001038f.bin
d30dd5d750b401449352644ce8135ebaec211a7d8d03eec7852d7469d6f0d6eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 5464 bytes
font_01_sfnt_off0001162a.bin
258c39677e8b0b13e3c355cac850a062c40a05915e7f346d5b87be4efdaa2e3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1162A 10864 bytes