Malicious PDF — malware analysis report

Static analysis result for SHA-256 90653d39ace252ab…

MALICIOUS

PDF

85.2 KB Created: 2021-04-12 19:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 60f95a3553ddf7e16a3947c7480b8dff SHA-1: 581067792faee3c3148d25b7fe038940bfc2b444 SHA-256: 90653d39ace252ab4e82b26ea43577c249d557b4bf7fa20e7b3792fa8ebfc754
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/strik?utm_term=romeo+and+juliet+dire+straits+piano+sheet+music+pdf PDF link annotation
    • http://disclosures.space/90762713162n62zw.pdfIn PDF document text
    • http://letogala.iblogger.org/auditoria_financeira_exercicios_resolvidos.pdfIn PDF document text
    • http://tranquils.space/what_did_the_suffragettes_do_that_was_violentwerxu.pdfIn PDF document text
    • http://gepozuj.iblogger.org/bahasa_inggris_think_globally_act_locally.pdfIn PDF document text
    • http://about-fb-support.com/84693672717wg0em.pdfIn PDF document text
    • http://ketosimple.online/times_tables_worksheets_year_3_printablezkdzp.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/cd20f5f3-4025-4e33-8001-9fcb8265dc30/starcraft_boats_for_sale_mn.pdfIn PDF document text
    • http://nesasodatujor.epizy.com/venue_report_palm_springs.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_fdda18788a26487394f323196da178a8.pdf?index=trueIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_453cd80670f144b0bb0c976d5b7f3aee.pdf?index=trueIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_c6d73314cd9b46408776b8c2eee355e9.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_3be002bcdbae44609d59e331d7f9adec.pdf?index=trueIn PDF document text
    • http://katujomun.rf.gd/kemibilig.pdfIn PDF document text
    • http://mefugifidilaxi.rf.gd/what_size_windshield_wipers_do_i_need_for_a_2012_ford_focus.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/40934311629.pdfIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_1c8eb61e99474b949fe8e078570d6ad3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/samsung_m2070w_wireless_setup_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01b32612-b555-4784-a620-c9abf10754fa/15797726256.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/namopavalovuson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/795ab321-7cd5-41fb-b99e-65b67e2a154d/poxudozupujafibomaxem.pdfIn PDF document text
    • http://minirulo.epizy.com/tefuwekile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b61b6c0-b35b-4f89-a926-47c2dca99c35/72450566648.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_off0000f962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF962 5476 bytes
SHA-256: 6dd1e3a680da2f7ad7d55881afa340d8e2b63379b34da942fead66f04a71e269
font_01_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 11164 bytes
SHA-256: fca1bf2a5030d0c24452bef0eea343dd4522a6945457f1ec3be53af9238bbb9a
font_02_sfnt_off000131e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E7 16100 bytes
SHA-256: 84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52