Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53f3d114a470481…

MALICIOUS

PDF

77.3 KB Created: 2021-03-10 00:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 29156fb87ba729e24eeb4a44e6377b28 SHA-1: d67f7c6c399b8230d8fb7492f9a6a26ee3e8dcda SHA-256: f53f3d114a470481c51cca6ba6e1f4f69cdca6ccc19461d718806fb6bdc15a8f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm with numerous embedded URLs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the classification as Pdf.Phishing.Trojan strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/123?utm_term=af+maay+pdf PDF link annotation
    • http://dupuladusudired.mypressonline.com/top_100_interview_questions_and_answers_book_free_download.pdfIn PDF document text
    • http://fogafiv.mypressonline.com/magic_bullet_washing_instructions.pdfIn PDF document text
    • http://dudoxanudito.scienceontheweb.net/refraction_of_light_at_plane_surfaces.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/foderozevumusuxururelulin.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/netgear_n600_router_reset_password.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/32738890111.pdfIn PDF document text
    • http://dabopoxele.getenjoyment.net/cursos_de_ingles_en_college_new_york.pdfIn PDF document text
    • http://nifepanasobe.iblogger.org/dell_latitude_e6410_ethernet_drivers_windows_7_32_bit.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/janobelimerafazibi.pdfIn PDF document text
    • http://wutoxurusot.iblogger.org/kesafodaxekiwemofarurap.pdfIn PDF document text
    • http://xenifizonuk.22web.org/64939578482.pdfIn PDF document text
    • http://kulibakux.iblogger.org/najalekagepodete.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_7829d7d616914670bcf086c382f0938b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/84216159658.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/vabakomir.pdfIn PDF document text
    • http://jomupaz.myartsonline.com/mapa_de_africa_con_nombres_para_imprimir.pdfIn PDF document text
    • http://gebopotaxe.rf.gd/87903168647.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/51898724946.pdfIn PDF document text
    • http://susabumo.atwebpages.com/fajirakowokajuzurama.pdfIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_6199b6b86881494eaa929686234635c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/banner_editing_material_png.pdfIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_aa4483c3862243c4bd20b41e17c6ad6a.pdf?index=trueIn 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_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 4972 bytes
SHA-256: b87dd9bc3ee15ce40753f1585e072a53112f7afd8dfee1a28cb4fc780c139e8a
font_01_sfnt_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 12132 bytes
SHA-256: 130160d56d3c16ee9d445afaca30246b38376dc0af2364d000358842ff2b4fe9

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