Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad0a4aec1159fc0…

MALICIOUS

PDF

79.9 KB Created: 2021-04-05 13:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01a6a7493a73b7d1b0cea93686769560 SHA-1: 7a3412eb6d3011888406e983712398211110c3f0 SHA-256: cad0a4aec1159fc0db08f2bc4f58a8e2c11e11bd5f77cdc7179a3f75402f2161
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI that redirects to a URL designed to appear as a search result for 'Bjarne Stroustrup books PDF'. This is a common social engineering tactic to trick users into downloading malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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://resalured.ru/award?keyword=bjarne+stroustrup+books+pdf
    • https://cdn-cms.f-static.net/uploads/4503533/normal_606574bc8bc7c.pdf
    • https://cdn.sqhk.co/baruduwege/hqggQie/voice_lessons_to_the_world_vocal_course.pdf
    • https://cdn-cms.f-static.net/uploads/4401691/normal_605d86031cceb.pdf
    • https://static.s123-cdn-static.com/uploads/4403806/normal_5ff6c42de7fa5.pdf
    • https://cdn.sqhk.co/sojuzafu/jj9xA3c/luxury_fox_fur_keychain.pdf
    • https://cdn.sqhk.co/nizufalagef/Pgflrhb/vikings_packers_game_time_today.pdf
    • https://cdn.sqhk.co/rivotoxupow/7gdjigi/zololixiribikeguvuzime.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gidepajujida.rf.gd/10110860419.pdf
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_12f9cca41a5747d18a7b6ed4e99ce4a0.pdf?index=true
    • http://jugixumob.rf.gd/1985_toyota_pickup_bed_repair_panels.pdf
    • http://tozoduva.rf.gd/adobe_illustrator_retro_poster_template.pdf
    • https://s3.amazonaws.com/jazamerijekufol/edenpure_gen3_model_a4136.pdf
    • https://s3.amazonaws.com/mokuwanibof/vujijigapusepowoxafip.pdf
    • https://s3.amazonaws.com/tedowafomaru/loxifareg.pdf
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_7336941596e7487f9e600c0b1d3c6493.pdf?index=true
    • https://s3.amazonaws.com/xepululejiwof/fallout_4_four_play_guide.pdf
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_fa8a60f3fefc42fd8e11fdbd3be58321.pdf?index=true
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_d808e80d00e3452a9bafdbb227c19949.pdf?index=true
    • https://s3.amazonaws.com/legesiliv/the_quran_and_kafir_book.pdf
    • https://s3.amazonaws.com/vososasoxumete/her_name_in_the_sky_summary.pdf
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_5f34a9c1d30b4297a4325cf5eccd5bd2.pdf?index=true
    • http://vezogut.rf.gd/28145659585.pdf
    • https://s3.amazonaws.com/wufujudisu/copersucar_sa_annual_report.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_off0000f089.bin
34107607d61c4b512e35a66f12ce7df7a23fee4907e2419fbcfb9d765a98f86a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 5332 bytes
font_01_sfnt_off000102ba.bin
3d9c3fb6652bea157a6591724f59d99a3967c8db217504f9a89c9df80d63dcda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 15152 bytes

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