Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12e0dc089eca25a…

MALICIOUS

PDF

116.6 KB Created: 2021-04-05 02:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ffdde74e63922b46fae1a1b7258b03fd SHA-1: 2c6102f4906d941dac23421feda832a5d3082cc2 SHA-256: a12e0dc089eca25ac28487642d71c728f67af99af0ca20a79e025242192bbf96
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, characteristic of a link farm or phishing lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a browser extension or update, a common tactic for credential theft or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/strik?utm_term=dell+xps+13+9365+i7-8500y+review PDF link annotation
    • https://cdn.sqhk.co/vinasujitupe/cgedBjb/nuclear_chain_reaction_definition_chemistry.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/gOF83hc/top_ten_retro_boxing_gloves.pdfIn PDF document text
    • https://cdn.sqhk.co/duxajoje/ghaigha/jurupi.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/jie1eOf/daxojapiwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/how_to_use_my_sd_card_on_my_samsung_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/vocals_for_mixing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b53ddd-11ec-40bd-a03b-ca2cf348154d/kumos.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/81043193492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee5d148-3546-48ac-8594-74909fd843b9/osha_sample_written_safety_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3768b5d3-9c0e-4481-b43a-d1ad815557d7/hp_p1102_printer_toner_price_in_bd.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/aadhaar_enabled_biometric_attendance_system_software.pdfIn PDF document text
    • http://rawobebisef.epizy.com/famovebosovet.pdfIn PDF document text
    • http://sobogasitizi.epizy.com/create_vm_in_availability_set_arm_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/hp_laserjet_cp2025_service_manual.pdfIn PDF document text
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_370acd5065d74cfd93e3ca9e4f036fce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/negonanopix/impossible_game_answers.pdfIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_0709e52bf05740ee9ffb8139020ef9b5.pdf?index=trueIn PDF document text
    • http://wosunitiguzivef.epizy.com/atlante_anatomia_microscopica.pdfIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_e34b607391214155a1ec1b50caea9e01.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_e0a8d3fdf68d4bd5adf2a2e40f448ca1.pdf?index=trueIn PDF document text
    • http://piwirapofo.epizy.com/wilojopajakekuvo.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_off0001708f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1708F 6020 bytes
SHA-256: 5a6dc8d9ad65cac2d94c4915a87b6f391f85468038500882c883d18af8b39997
font_01_sfnt_off00018543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18543 12428 bytes
SHA-256: e7dd99262154645008ed4c7620a34f66fe8a88cfe448ff0af4238c0fb05200a2
font_02_sfnt_off0001af8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF8D 16136 bytes
SHA-256: 458cdb6cd81316f30fb0ccd866f07003e9e90fffd73d7abac7cbb11106211348