Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23275b16e5a6c9c…

MALICIOUS

PDF

76.9 KB Created: 2021-03-29 06:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b3ed34dce95fa9c54fff9029a89d6bf7 SHA-1: b2218cfe01aa65d47abaa552b8cf9ba4cb1f7aa0 SHA-256: d23275b16e5a6c9c59ce2065f8238c56a7fffe3f0c97af15789e423f4b2fb362
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious sites.

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://leonvi.ru/award?keyword=advantages+and+disadvantages+of+technology+pdf PDF link annotation
    • http://bilapak.66ghz.com/wodifuxapelubezafi.pdfIn PDF document text
    • http://wopizup.mypressonline.com/what_i_wish_i_knew_before_i_got_married.pdfIn PDF document text
    • http://gilopiporu.iblogger.org/cambridge_checkpoint_mathematics_coursebook_8_free.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/prepositions_nouns_phrases_exercises.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f2e1c32-1116-4fd0-872b-753144a0b1d7/best_machine_learning_library_python.pdfIn PDF document text
    • http://laxukumelukadut.myartsonline.com/calendario_2020_peru.pdfIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_1be34ddfe4a64571bfe7744fe875935d.pdf?index=trueIn PDF document text
    • http://tiwatimab.atwebpages.com/edgar_allan_poe_cuentos_de_misterio_e_imaginacion.pdfIn PDF document text
    • http://rejazimuperolik.rf.gd/tell_me_about_yourself_for_interview_answers.pdfIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_bb599ebcd382413da453392c94af9ad9.pdf?index=trueIn PDF document text
    • http://zoridod.epizy.com/74348971445.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30448055-fd02-4340-b231-91a60517cc5b/fujitsu_halcyon_inverter_filter.pdfIn PDF document text
    • http://visunes.myartsonline.com/community_ecology_morin.pdfIn PDF document text
    • http://jawozamamopenis.rf.gd/vixotabazerijisaru.pdfIn PDF document text
    • http://wulekugigewipo.epizy.com/vozixegifedagitanuz.pdfIn PDF document text
    • http://xaxotuk.epizy.com/dead_sea_scrolls_translated_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5652264c-b98c-46c6-b997-be829a5d4f7a/kitibebet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c887438-7dbb-4d61-b857-d8bc9523dc0e/99542841472.pdfIn PDF document text
    • http://nabafomubibatu.epizy.com/how_to_program_bearcat_scanner_bc345crs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349b93b2-16e7-4ede-a8e0-f251860d0002/syma_s5h_helicopter_instructions.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 5472 bytes
SHA-256: e0e97aa2a9b73ae0233fde50f771814c1bb39205afc9d2ad32e00f4b804ba5d4
font_01_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 10736 bytes
SHA-256: 5877993b77b5f23cdb2874e0688e42e8cb87b5c7e631aa3fe92acd36a59a054e

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