Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b92c795402826f…

MALICIOUS

PDF

78.8 KB Created: 2021-03-14 02:00:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 55561454699bedf60320ed83fbfeb351 SHA-1: 5f1958f3e70c243e8a2b1b17e836504a3ba4dd63 SHA-256: c3b92c795402826fc61053218328eaab3e4a65284624a5bc14f55467397b7ef0
134 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/award?keyword=bankers+adda+syllogism+pdf+download PDF link annotation
    • https://cdn.sqhk.co/mokavokaven/IVp6hi9/kusekasafiperusisu.pdfIn PDF document text
    • http://mishabelle.ru/427915752396r5ch.pdfIn PDF document text
    • https://cdn.sqhk.co/wejupexuput/hhi6jc5/xapumukobiw.pdfIn PDF document text
    • http://lokalumamone.iblogger.org/positive_words_that_start_with_d_in_spanish.pdfIn PDF document text
    • http://ejqy.com/rokogisetbeis9.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/jgjbgfd/zunoretekakurazar.pdfIn PDF document text
    • http://repochka.site/tecnicas_de_redaccion_parrafo_ejemplo42er4.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/moca_certification_test_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/K1LifyP/23068146082.pdfIn PDF document text
    • https://cdn.sqhk.co/daxonotetil/Zydvp4H/nupufadinuf.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/call_of_cthulhu_7er4uxt.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/is_procreate_already_on_ipad_pro.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/96f625c2-5974-4f72-8c39-6e9146a45038/descargar_diccionario_bblico_hebreo_espaol_gratis_para_pc.pdfIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_379da1b56a5b429b97cfaa2ea0121123.pdf?index=trueIn PDF document text
    • http://goxobiwab.rf.gd/azonto_audio_by_fuse.pdfIn PDF document text
    • http://nanisoz.epizy.com/glacier_national_park_weather_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/595a6df9-366e-47d3-936f-56f69ca3ae13/bezakidavilugopetake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef19a091-9314-46c5-8d7b-51a6a3dbba8f/74904265872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecbe40d5-0e2f-4892-8c1b-42e824def5ba/audio_in_media_10th_edition_free_download.pdfIn PDF document text
    • http://zepibugab.rf.gd/que_ph_tiene_el_acido_clorhidrico_del_estomago.pdfIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_0c46294789f645ee9212792351d99307.pdf?index=trueIn PDF document text
    • http://pezedavepajizum.rf.gd/amoebic_liver_abscess_guidelines.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 5668 bytes
SHA-256: ea6d7c485121cae57a5148101e683518d3976b52ccca51f18f64c4f4d3719106
font_01_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 11800 bytes
SHA-256: c685a537a9e9a3af9c5b09b04d19110fb74bd50c133c55b0e95a396ac3c041ab