Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5968e90985140b1…

MALICIOUS

PDF

75.3 KB Created: 2021-04-03 15:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b47e69d7df4ac6fe473e7e76b83ac977 SHA-1: aec1ff56c7b67c32d63fe98ddcc142d9ca085de6 SHA-256: f5968e90985140b1ac19a0c035eec6f23d81de5e008ed6999691a755f8e0f924
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 0.9996

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://nipisod.ru/wix?keyword=dongsaeng+meaning+in+chinese PDF link annotation
    • http://mopexaxurip.getenjoyment.net/toxuve.pdfIn PDF document text
    • http://linefofaxugedu.mywebcommunity.org/lizujoxoxuzatav.pdfIn PDF document text
    • http://islemleriniz.org/how_many_hours_do_you_need_to_work_out_to_see_results5b0yw.pdfIn PDF document text
    • http://boothattendant.com/famuxivaxesujijemobaziz850n.pdfIn PDF document text
    • http://ruxenawuxovogu.getenjoyment.net/53233291040.pdfIn PDF document text
    • http://juraxoxodas.scienceontheweb.net/nuvobuxuwomu.pdfIn PDF document text
    • http://suwefazimim.medianewsonline.com/oxford_bookworms_starter_level.pdfIn PDF document text
    • http://favarivizuna.medianewsonline.com/nojipoweputisuli.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/12998821494.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/ace047b0-3a7f-4de1-baf3-2581eba11981/creature_from_jekyll_island_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8cb201e-ad0f-4b5f-8b8f-964725a14174/microsoft_project_student_free_download.pdfIn PDF document text
    • http://xazopufegi.onlinewebshop.net/30474269923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11fad51e-e34a-46e6-9123-fc2caba12cdb/82895003241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d766ca-05c5-4651-9994-e530599b90b3/govapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/060c0ef7-092c-4882-8615-03b7eff4f512/red_cross_list_of_emergency_supplies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b50d959a-db3f-44ac-95d0-29deadfabfab/does_pals_serve_breakfast_all_day.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a846e7-2548-495c-a5ca-8e75a31a81d5/how_do_you_reset_a_fossil_smartwatch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/012bc5ba-f279-48d0-a854-99a2b42c9af4/how_to_repair_ge_top_load_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a2625f2-8ac4-4c61-a548-3a6d0f3fbe20/what_qualifies_as_gross_negligence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a6db1d-e682-4f4a-9007-4f8478c604ac/79754205370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be629d31-442b-4271-b41c-b123e874b6bd/lexus_es300_oil_type_1998.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FB 6824 bytes
SHA-256: 3a443b7f9f236e68746e32149d97f705f320427ef9e76d66ea054145410aa180
font_01_sfnt_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 5084 bytes
SHA-256: 79b61b1ca986e5845941f38bc8e97e22bb5b2cbe7384e688a328389b944ec7f6
font_02_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 10928 bytes
SHA-256: ed6dd21a375200402bb7413f764a8121ba56000e11ce7dc417ca2c86b2a6e44f