Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe4ccd2ef459802…

MALICIOUS

PDF

84.0 KB Created: 2021-03-18 16:26:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0df9250cdd836584720f8ed5480808d5 SHA-1: bb9e5b506539f2327fd606a2e4c777f6f825c5ca SHA-256: 4fe4ccd2ef459802e5463dbc09249f34df43db591d8fff320667281b46885b0a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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. The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/123?utm_term=cloudformation+reference+s3+bucket+name PDF link annotation
    • https://cdn.sqhk.co/tofatuxurejo/e72icif/harkins_theatres_casa_grande_az_showtimes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457560/normal_6052da88de10c.pdfIn PDF document text
    • http://bostpolamos.site/power_pressure_cooker_lid_replacement519uu.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/ALHFjh9/40663319335.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/jddjcLY/92818696809.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/XTZhaij/aimpoint_t2_review_ar15.pdfIn PDF document text
    • http://cmbclientes.com/50126354475rg753.pdfIn PDF document text
    • http://mbfsopg.com/mearsheimer_the_tragedy_of_great_power_politicsohv9i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445745/normal_5fcfb43bb5873.pdfIn PDF document text
    • http://fortuneo.biz/cuantos_litros_hay_en_un_cm_cubico7jumj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465564/normal_601d2ff45bbd8.pdfIn PDF document text
    • https://cdn.sqhk.co/goponebegor/BhgQqrI/pediatric_sepsis_guidelines_2018_ppt.pdfIn PDF document text
    • http://urro-hu.com/lego_technic_idea_book_wheeled_wonders2z5vt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/60735372814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ac3de2d-2135-4edb-a476-f2a0276450b6/judib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53680046-32d1-4ee0-98ac-3122074fd223/98881544023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297f0d4a-e92f-4f72-b34c-755696824983/94327245412.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/12808530114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d8223f-29a7-4016-b56b-ed3fb50ff7ce/interior_designing_apps_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/92627952738.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/sunemulizarewukifikakofez.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/hunger_games_chapter_25.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/fosutizuzigikixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db7b228-a00e-404b-939d-94d71aeb7f49/19726972367.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_off00010b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 5440 bytes
SHA-256: 7891680698125f92236ec576f1c616dbc1ead80939ebdb60666eaf441e002014
font_01_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 10668 bytes
SHA-256: 7ed4b03825d5190e10b4ab247f76336fb8b52b54e996e577147b9a00e42c7c63

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