Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d299f890a244da…

MALICIOUS

PDF

84.3 KB Created: 2021-03-30 07:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5dd0643e22b225842a84f40f78301e52 SHA-1: 64d97779487923c70f73a7c2d19685397d58fdd8 SHA-256: a5d299f890a244daab0f8189ec7fba23a5fcd30bd21d2a10dc3e6a2ec6e52e6f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed to direct users to various malicious PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/wix?keyword=wow+tomb+of+sargeras+guide PDF link annotation
    • http://bbbbbbbbeeee.space/walmart_bed_sheets_on_sale4581j.pdfIn PDF document text
    • https://jepibuko.weebly.com/uploads/1/3/0/7/130739686/lidaji_rexaridonudiwep_luxojelen_sikezadup.pdfIn PDF document text
    • http://theandyhong.com/54615166763qj6ae.pdfIn PDF document text
    • https://dusoveri.weebly.com/uploads/1/3/1/0/131070325/540355.pdfIn PDF document text
    • http://leqqurint.online/is_goat_simulator_multiplayer_on_nintendo_switchhyqhj.pdfIn PDF document text
    • http://shopsmmv.site/sugeguwareiecko.pdfIn PDF document text
    • http://presalon.xyz/how_do_i_contact_fedloanknnis.pdfIn PDF document text
    • http://nature-ital.space/nirixq6a79.pdfIn PDF document text
    • http://businessoutsourcing.org/wurutujonaxokikupepalesofrjnb.pdfIn PDF document text
    • http://acgmgroup.ru/79037455791gchp8.pdfIn PDF document text
    • https://gazumewus.weebly.com/uploads/1/3/4/9/134901575/5866738.pdfIn PDF document text
    • https://wuxorazaw.weebly.com/uploads/1/3/2/7/132712222/8c93297607e412.pdfIn PDF document text
    • http://becloud.website/salugadv0h.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/tadevewuju/child_development_and_pedagogy_ncert_books.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/ars_poetica_orazio.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/what_is_the_top_speed_of_a_scooter.pdfIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_301c1ffe5c8e490f80630109883043f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/libemawazedazu.pdfIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_a8a00b9c2abb44e6b684ff9c945e9dcc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vunizi/vusifonabubewekinadag.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/marvelous_designer_7_manual.pdfIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_88d1d2e507ef47cf91cb81f93835ae65.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_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 5440 bytes
SHA-256: 4e92214eff02262e4a0851eb360d981e5873c14cd86bb4d37983953c3a03084c
font_01_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 15252 bytes
SHA-256: 145879ae872cee452f72ab4fe5b71cc22fc4106aec02162b26e13035c7e4a34b

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