Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0d995936d9d0663…

MALICIOUS

PDF

80.5 KB Created: 2021-03-24 17:20:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d90d670185a458970743b0103865330 SHA-1: e1589a43ae2b2377acca4b712f53a2b1cca02a44 SHA-256: e0d995936d9d0663778f11fbfc13260801399f17e55ebf38bcb25ba8dbdfb2d0
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of these links, https://zajinet.ru/award?keyword=additional+mathematics+pure+and+applied+pdf, is flagged as unknown reputation. The ML classifier also strongly suggests maliciousness. While no scripts were explicitly extracted, the presence of numerous links suggests an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/award?keyword=additional+mathematics+pure+and+applied+pdf
    • http://usene.xyz/anonytun_app_freen7uqd.pdf
    • http://verification-help.com/resident_evil_7_biohazard_for_androidyncbs.pdf
    • http://pl50off.info/wawoxatovnu64u.pdf
    • http://cetop.xyz/artificial_neural_network_algorithm4togf.pdf
    • http://4338bacchus.com/47272237603rbobf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jidagafinuxesu/dyson_cinetic_big_ball_animal_vacuum_sale.pdf
    • https://b993c520-4fc9-488d-8dda-35d8b3dc2713.filesusr.com/ugd/6f5492_5a39eabe8ecc45438498022d30bb39f8.pdf?index=true
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_ebb157e1568940dda5414e53d1f09c51.pdf?index=true
    • https://s3.amazonaws.com/nemafu/90233758297.pdf
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_c3938b177d0845c1bb357cf61198b403.pdf?index=true
    • https://uploads.strikinglycdn.com/files/789b8974-811c-47e7-935f-425b8a866426/kuvidikosujupewitap.pdf
    • https://uploads.strikinglycdn.com/files/3dbbdefc-e563-4f10-8d86-605081463766/how_many_different_species_of_praying_mantis_are_there.pdf
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_be9da53306384e3c9ef5f76eff2383cc.pdf?index=true
    • https://s3.amazonaws.com/vizegemawokaxe/5890734867.pdf
    • https://s3.amazonaws.com/lorugipopuxe/australian_passport_renewal_form_2019.pdf
    • https://uploads.strikinglycdn.com/files/54729dc4-ae10-4ec9-9029-bc56991f8374/how_to_get_calories_on_a_vegan_diet.pdf
    • https://s3.amazonaws.com/widuxade/trombone_sheet_music_star_wars_free.pdf
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_fccbab1ef5f94cc493dc4877f43c722a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2eca5409-ff03-4aed-9a4f-62676570b3fc/8221842111.pdf
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_4b96a8a3fa8441d48e85708e02cbfa1e.pdf?index=true
    • https://s3.amazonaws.com/kuboki/7438263517.pdf
    • https://s3.amazonaws.com/memexelu/guia_autometrica_libro_negro.pdf
    • https://uploads.strikinglycdn.com/files/b552e99f-59c2-40e2-9fd1-bd41d4bbb576/linksys_rangeplus_wireless_router_wrt110.pdf
    • https://s3.amazonaws.com/bofake/pitney_bowes_postage_meter_not_printing.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd9f.bin
1440ba64ae18ebb9e472a843bc69c72378cee08308dc09aa588011c2b42e1a43
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 5384 bytes
font_01_sfnt_off00010fc4.bin
b41bd42e0ae5e250fa4383eb10815cb271b5485891409362b142bfa5b873501e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 10764 bytes