Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7f025ae38aa84e…

MALICIOUS

PDF

77.7 KB Created: 2021-04-03 08:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e8476fddc5b498a6d47fef6bf2de30a5 SHA-1: e84cd7aa4828ecd78968c174b27ec6a32f6257ee SHA-256: eb7f025ae38aa84e4dd100096366c1a6632bd865353b6e207d194a5504b31df4
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a mechanism for distributing further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs supports this assessment. While no scripts were directly extracted, the PDF structure and the heuristic firings indicate a malicious intent to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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://dugedepap.ru/123?utm_term=free+printable+bible+worksheets+for+preschoolers PDF link annotation
    • http://sosabuso.22web.org/azure_sql_db_backup_free.pdfIn PDF document text
    • https://lokevevivepino.weebly.com/uploads/1/3/4/1/134131736/medisufudexuf.pdfIn PDF document text
    • https://riwozetamozu.weebly.com/uploads/1/3/4/3/134331456/77dbf78173f2.pdfIn PDF document text
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/tejadogozuxokak.pdfIn PDF document text
    • http://svarka-aurora.online/boreniwenivibogje75.pdfIn PDF document text
    • http://zavodtriumf.com/audiolibro_el_poder_de_la_oracionama1p.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/kotakit_daliwur_zizagu_xulubuzoba.pdfIn PDF document text
    • http://wufutawolemipa.22web.org/anabolismo_y_catabolismo_unam.pdfIn PDF document text
    • http://xadazobisisim.scienceontheweb.net/hp_elitebook_6930p_laptop_wont_turn_on.pdfIn PDF document text
    • http://mrshadow.net/15492652293qfyu9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://namupurifu.epizy.com/all_beatles_music.pdfIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_a981721ef14945a78f773fd75b19185d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/hamlet_act_1_guided_reading_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/58374929609.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/40888534474.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_da0004f4396140cdb875a0e3348608f3.pdf?index=trueIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_232a630cff6c4add961232b6d644dae1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/counter_strike_1._6_size.pdfIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/what_age_group_is_the_hobbit_for.pdfIn PDF document text
    • http://vowafixugologu.epizy.com/assortment_planning_process.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/arabic_fonts_for_mac_powerpoint.pdfIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_33addb9a08744941a1c90d6078260d2e.pdf?index=trueIn PDF document text
    • http://tanamumejoxa.epizy.com/biwera.pdfIn PDF document text
    • http://dijipola.onlinewebshop.net/alaska_map.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_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 5352 bytes
SHA-256: a7460352ced6972b56f4e21ddaf994d500ad7df91d58465b9f84b4c3da6010e0
font_01_sfnt_off00010284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 10728 bytes
SHA-256: ccc45c0cfbbfc47d63cddfaa3d4319a487b31e04fd426bb6a56af1a4192755f3

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