Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de8d87726dfe534…

MALICIOUS

PDF

80.0 KB Created: 2021-04-07 02:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c0a4f19e8d4f31bf9faa8b94e7f37336 SHA-1: 28fc857f45ce8502c0866fb19f3ca07aec6a6dcf SHA-256: 6de8d87726dfe5342eb3721f53d577556057bfdbfb463a51d0f4ae63fc045db8
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via SEO poisoning. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/award?keyword=diabetes+insipidus+treatment+pdf PDF link annotation
    • http://xasujaru.22web.org/sazev.pdfIn PDF document text
    • http://zadidibupinumav.22web.org/zibeginemod.pdfIn PDF document text
    • http://zobuzireb.22web.org/beekeeping_for_dummies_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_605a39c09b35c.pdfIn PDF document text
    • http://jadusugogawal.iblogger.org/livros_biblioteconomia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388839/normal_5fdeff86bcffd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486743/normal_6063f490eb0a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_604ce4e45365f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://botalibinizor.rf.gd/chorale_from_jupiter_piano_sheet_music.pdfIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_4c957df204c64de38c36bce254f8a70b.pdf?index=trueIn PDF document text
    • http://kazoverowagodi.epizy.com/bollywood_movies_2018_in_hd_avi.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/curso_de_ingles_para_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/8195003434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd80750-07bf-4d67-859b-07a5779822db/humminbird_helix_5_chirp_si_gps_g2_fish_finder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2244b766-5872-4fec-9d4a-923825f3860a/how_much_does_it_cost_to_fix_charging_port_on_laptop.pdfIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_57e025465a524a87bed253d7aecf25ed.pdf?index=trueIn PDF document text
    • http://filabobis.epizy.com/91094804252.pdfIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_28443279c0054ce8a0349c7400b1c48e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jusuberu/74204716514.pdfIn PDF document text
    • http://xarozitapakegur.epizy.com/asking_for_a_job_email_template.pdfIn PDF document text
    • https://4b98dde3-f65d-4e11-807b-d4501949e87b.filesusr.com/ugd/4a7ebd_8b9be07564dc4d11b9707b0925d3c016.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/sql_server_2016_books_online.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_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 5296 bytes
SHA-256: 4c2f18dcaf56f1e091f6766f95b7802a6d6751f1f9818c70ee3e80b2980d7f1b
font_01_sfnt_off00010de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE9 10832 bytes
SHA-256: 3fc8cadb1acd8d2ff170707a60e32b33bfc5594ffad2d3842b8e88e8f73ec942

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