Malicious PDF — malware analysis report

Static analysis result for SHA-256 0623670c615dc94f…

MALICIOUS

PDF

77.8 KB Created: 2021-03-29 23:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7dbfa4fdc2a9dc9fca0fb6d6e4540919 SHA-1: 5951ed5fff314610dfd587a9ccedf935af06a6a4 SHA-256: 0623670c615dc94f00a69ad51b3c642b06115cac62689178cc46d5652991cbcf
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=samsung+galaxy+s4+mini+phone+case PDF link annotation
    • http://lufafemazivug.iblogger.org/ejercicios_resueltos_alcanos_alquenos_y_alquinos.pdfIn PDF document text
    • http://sizuxubotinukor.22web.org/habitos_alimenticios_saludables_para_nios.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/70790297085.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/iThffig/movistar_play_descargar_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/ijjaX3a/46405421263.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/7_split_merge_portable_2._0._4._112_free_download.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/dometic_rm1350_not_cooling.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/where_can_i_watch_bosch_in_canada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_e1d5aec0427b44b894a4b1c333b177a1.pdf?index=trueIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_f1aa7349493049fa8c089520d0c6f747.pdf?index=trueIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_e32a2a0184f04c30a70f2a879ff9d8bf.pdf?index=trueIn PDF document text
    • http://wupoxinow.rf.gd/how_to_record_pc_gameplay_with_elgato_game_capture_hd.pdfIn PDF document text
    • http://nulitapa.rf.gd/alfonzo_hunter_album.pdfIn PDF document text
    • http://judowasejalux.rf.gd/60878634148.pdfIn PDF document text
    • https://d74058ad-8c31-4576-aeb4-582a73b10e1e.filesusr.com/ugd/666c83_6cd0e289be6e45f39fa497982e78ff76.pdf?index=trueIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_e9fadeca4aac4d3a910372e68a0f333d.pdf?index=trueIn PDF document text
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_7b2734c999c24deb91c06c5bc5bbf03d.pdf?index=trueIn PDF document text
    • http://zukomakiduw.myartsonline.com/68712591496.pdfIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_9925e7fb40a0473e9da7dad471ecf07c.pdf?index=trueIn PDF document text
    • http://xulodolab.epizy.com/free_font_montserrat.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_off0000efa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 5612 bytes
SHA-256: b4da5436d1595535d642b068b9e4ca3d927f7999fb6a2f6264c1b20797656b9b
font_01_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 11068 bytes
SHA-256: 80b522a255b468766848b34d4061258a22ece09f966efa598a0965e1c47ccc60

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