Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a92375ac056af5…

MALICIOUS

PDF

80.5 KB Created: 2021-06-08 04:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 05f07904036f164c6e32ad8031faa130 SHA-1: 6bd3c4007d3a3f46a36d314dbbebfdd272aa66a9 SHA-256: 85a92375ac056af5f57be653c5bb0a1f32c6dfbfcaf96cc0d26c4a1132644f04
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to a suspicious domain, xezojetit.ru, which is likely used to host malicious content or redirect users to a phishing site. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall heuristic firings suggest an attempt to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/123?utm_term=the+bluest+eye+afterword+pdf PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf05794-cf76-4512-8992-dbb8d7c32610/pelujutunole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e8e9a7c-8c31-49af-b60e-d97f5daa5333/nabogijepuwepeworugadopoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf9ec3fe-9298-4a68-ab02-41b70335264a/the_siege_of_yorktown_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0e65711-a7f9-4905-834f-4d23e5689451/best_exercises_for_stomach_fat_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd447f1-1216-480a-b0f0-f07284f2fa2d/haier_air_conditioner_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8e01ca-2944-491e-9895-46078e9fe0f6/xigolixilogajusopa.pdfIn PDF document text
    • http://lesotarizim.pbworks.com/w/file/fetch/144824586/excel_module_3_sam_exam_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/431bfcf8-c102-434a-927e-8a7e21e07647/black_and_decker_18v_battery_charger_problem.pdfIn PDF document text
    • http://murenet.pbworks.com/f/rozeleroxi.pdfIn PDF document text
    • http://tozuxexap.pbworks.com/f/78006975891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51267807-c561-4471-bc5f-a04b52136119/75971277313.pdfIn PDF document text
    • http://kufugaref.pbworks.com/f/pazegibizezelotowalisib.pdfIn PDF document text
    • http://kigemulu.pbworks.com/f/pradeep_biology_book_class_10_download.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/f/nizijudeloxebetilotixavak.pdfIn PDF document text
    • http://wevapejatu.pbworks.com/f/bomumumojofupatidune.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/why_is_my_direct_wire_smoke_detector_beeping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44ecc3f3-107d-42b9-bb1d-a72e1f1690f9/76305613896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd72f53-2893-4a69-9db6-8a09af52b5bc/limpieza_de_higado_y_vesicula_andreas_moritz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d022ce71-57ed-427d-bcf3-41744840bb3b/which_salt_is_more_soluble_in_acid_than_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23784036-7bfd-4272-9711-70cc7faf3f7c/tosujesebosanorekonewa.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_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 5412 bytes
SHA-256: 473afacc9de05417b3e536d0e168cc3a6680e5d7111c66d846616014247a82d7
font_01_sfnt_off00010ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE9 11292 bytes
SHA-256: a244b66ac6bd17ebfba7daa564b04d3ef9f6f6e197b382c690efb0d7ae64124a

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