Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9835fce622053f7…

MALICIOUS

PDF

95.8 KB Created: 2021-04-07 16:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9717be1ee7e73c084f2adb335f1c72ea SHA-1: bc142578e7bc2e1c5186f4792b8aedfb1f02ddbd SHA-256: a9835fce622053f72434be0987c09977c46c68165c76f8e0622f5233509133b9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as educational content related to trigonometry. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary malicious URL identified is pelibifir.ru, which is likely used to host or redirect to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=trig+functions+isosceles+triangles
    • https://cdn.sqhk.co/wajidafix/4V4gguj/carpet_3d_model_corona.pdf
    • http://help-feedback-amzn6.xyz/java_string_format_long_numbera5gt6.pdf
    • https://lirigudufov.weebly.com/uploads/1/3/0/7/130776684/sesedulodumorim.pdf
    • http://timelessdecorum.com/descargar_la_casa_de_mickey_mouse_en_espaol_utorrentk027i.pdf
    • https://cdn.sqhk.co/puvubuzu/gM7AUia/kung_fu_karate_fighting_games.pdf
    • https://cdn.sqhk.co/duzupafuj/pJt6ihX/jidefidunapad.pdf
    • https://cdn.sqhk.co/fabokofe/higQv1T/dog_birthday_cake_recipe_4_ingredients.pdf
    • https://sujozomamuv.weebly.com/uploads/1/3/2/6/132681492/sapufezifa_ponizapesapofe_nowulezewupoge_samemewaz.pdf
    • https://cdn.sqhk.co/sesijisova/Z5E3mEp/best_recipes_chocolate_mud_cake.pdf
    • http://sport-stavki.fun/mozifilizujuranikepurujihk9.pdf
    • https://cdn.sqhk.co/menigopas/Upjfl93/social_connectedness_theory.pdf
    • https://cdn.sqhk.co/nitunoda/Yjaqeii/lomokatomirekelo.pdf
    • http://hytri.com/x6km9.pdf
    • https://cdn.sqhk.co/ginijetemepa/gfgcjam/89136353252.pdf
    • https://cdn.sqhk.co/fuvepelela/hI6PXEm/43197933308.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nawuvud/carcinoma_epidermoide_cervix.pdf
    • https://uploads.strikinglycdn.com/files/7e40c6ce-1573-495d-9253-c8578c897b4b/11858209568.pdf
    • https://s3.amazonaws.com/wazorixekunafob/64834766064.pdf
    • https://uploads.strikinglycdn.com/files/373becae-c80f-43b9-a7fa-12b94f93ba1d/how_to_make_a_vrchat_world_public.pdf
    • https://uploads.strikinglycdn.com/files/e972857c-adb9-4174-89a5-d3f33502c62a/why_was_the_republic_of_doyle_cancelled.pdf
    • https://uploads.strikinglycdn.com/files/f35c6bd6-3e9c-42c2-84a7-6c14b1511f83/betego.pdf
    • https://uploads.strikinglycdn.com/files/6763396d-0aba-4250-9dfc-3e57700fb733/optiplex_780_power_supply_reset_button.pdf
    • https://s3.amazonaws.com/widofafane/where_is_the_serial_number_on_a_grand_piano.pdf
    • https://s3.amazonaws.com/setigafat/89195647916.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001071d.bin
ab3360034596dad08acef84027708bbed76674eb875c996cd8866c2303fc20e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 7068 bytes
font_01_sfnt_off00011932.bin
cba52660d567e5e140c146eb8579ced4d36d2e72ab0ff556a3710646468ea7b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11932 4996 bytes
font_02_sfnt_off00012a49.bin
fc3ef9efdc3ede33d02fbc8d475651a4de19b4e9014f45cb64f1ee279478adee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A49 15100 bytes
font_03_sfnt_off00015a58.bin
062f8a7185608a18dbd56baf48eb14c791e3c6ea8866a2ddd6a03467109098f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A58 16072 bytes

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