Malicious PDF — malware analysis report

Static analysis result for SHA-256 91da93bafeea8dbe…

MALICIOUS

PDF

81.4 KB Created: 2021-03-18 03:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 35bca12bfa057c349bb92492f2b7cb12 SHA-1: 2356899c6d7f9b2e27c4ad064a297eb7e0ae5fd9 SHA-256: 91da93bafeea8dbe8ba749d2c66b7290efac66273897588423e536ab7579b023
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a link farm on disposable hosting, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/award?keyword=az+300+premium+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470228/normal_603e2ea28e420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461232/normal_604e6ec3f23d3.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/how_to_understand_the_bible_better_manly_p_hall.pdfIn PDF document text
    • http://vitrinachel.ru/how_to_solve_math_question_online9f4ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_602a6b7257832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480732/normal_6028a8350f720.pdfIn PDF document text
    • http://gatorama.space/charter_club_sheets_made_in_portugalw3n45.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/modo_congiuntivo_e_condizionale_del_verbo_innaffiare.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d7ccc9-db02-4a32-b132-e93db171f830/secondary_voltage_and_current_in_a_transformer_ranking_task.pdfIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_d5c0925c0fff42d7aea36b7d97586854.pdf?index=trueIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_4856002af694415cad1d4492fac2e055.pdf?index=trueIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_14ab6753a6c146048c2ce03e25ef4ed4.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_3a27c43be62f4dd282137883346887d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/excel_vba_date_format_yyyymmdd.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/baul_song_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/43489672895.pdfIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_cc36b1ea7fcf4fe69ec12befad378b78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c2618d8-9fc2-4ae0-bfdf-c61142586f3b/45044161276.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/beauty_by_jane_martin_quotes.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 5112 bytes
SHA-256: 9a50dbb785dbc604850088d4dd313921ad3d5d07bf850d361b20a663ad82eb30
font_01_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 11132 bytes
SHA-256: ddb4010ef9d7a221812541c98427829da5cca8b91ea577b5c1b068a0d8b90e15
font_02_sfnt_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b

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