Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91aec5fb6d06e6e…

MALICIOUS

PDF

76.1 KB Created: 2021-04-04 00:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f08ab35365f50d3d76bd74260d2bc06 SHA-1: 6bfe74877085bd6c2082b477b5a136bb0c4b05d2 SHA-256: c91aec5fb6d06e6e17bcab45b8709f520c1b67c35857d8a281bf39222c95bccb
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, suggests a lure related to 'boogie woogie piano licks pdf'. The presence of external URIs and the overall detection by multiple security tools indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=boogie+woogie+piano+licks+pdf
    • http://inertbhjbj.ru/what_are_the_parts_of_a_brother_sewing_machine3028c.pdf
    • http://nakanilo.club/55631932603rnri4.pdf
    • https://static.s123-cdn-static.com/uploads/4412584/normal_5fc70f819ed08.pdf
    • http://netewe9.xyz/vadupumu30gy8.pdf
    • https://static.s123-cdn-static.com/uploads/4403406/normal_5fc8dcf2ecc37.pdf
    • https://cdn-cms.f-static.net/uploads/4413851/normal_6060f5d70ea47.pdf
    • https://cdn-cms.f-static.net/uploads/4484093/normal_6044d157bea50.pdf
    • https://static.s123-cdn-static.com/uploads/4489402/normal_600654fc225a8.pdf
    • https://cdn-cms.f-static.net/uploads/4368248/normal_60380a213515e.pdf
    • https://static.s123-cdn-static.com/uploads/4469104/normal_5fc777e7ea004.pdf
    • https://static.s123-cdn-static.com/uploads/4408593/normal_5ff47f7bee8c0.pdf
    • https://cdn-cms.f-static.net/uploads/4379849/normal_60132adf130fd.pdf
    • http://idealsit.space/zulujanuzebiwuruxuxuspifra.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kozewuposoridil/caldwell_chronograph_android.pdf
    • https://s3.amazonaws.com/sorapobuk/who_built_angkor_wat_and_why.pdf
    • https://uploads.strikinglycdn.com/files/63450ff0-a776-47d8-a3e6-f0aadb5ba2ae/31050086736.pdf
    • https://s3.amazonaws.com/bojafazes/fojapakajegigabofilogikal.pdf
    • http://boxalage.epizy.com/what_is_a_wedgewood_stove.pdf
    • https://s3.amazonaws.com/patotale/pirates_caribbean_violin_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/1a6090bc-3ce5-43df-8436-10930cd35588/54221067211.pdf
    • https://uploads.strikinglycdn.com/files/4bcb0aa0-6363-464b-8c68-aeb1bf2fb69e/watsons_go_to_birmingham_chapter_12.pdf
    • http://fidotetunuxezi.epizy.com/7040072895.pdf
    • https://s3.amazonaws.com/tosego/full_anatomy_of_the_body.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_off0000e8b2.bin
15c4eeb0e268260dc2932035f579ef6de94a7ec47a1f2b413375b9d6084f959d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 5432 bytes
font_01_sfnt_off0000fb60.bin
8b3bf9abe486c2b4cfc1affca356c7f4bc4376c0b8a81488ae7ebae20adb0677		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 11056 bytes

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