Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a647071bdfa8f6e…

MALICIOUS

PDF

95.3 KB Created: 2021-03-23 17:18:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 53d4efe93753d3111a92b5fdf3a55618 SHA-1: 5a3ed1dc470389dc1930ab93bc8848b59703dfa3 SHA-256: 7a647071bdfa8f6eb2fcad1717c8a96d56e1ee3a6c6f41b76767e237be5136b6
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • 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://dafemum.ru/wix?keyword=disney+magic+kingdoms+mod+apk+4.9.0f PDF link annotation
    • http://hookup671.site/dexless_warrior_guide_maplestoryz36cx.pdfIn PDF document text
    • https://regurawuxafedan.weebly.com/uploads/1/3/0/7/130740517/xogafamunuvunufojes.pdfIn PDF document text
    • https://tilakajunobeka.weebly.com/uploads/1/3/0/7/130739719/8923331.pdfIn PDF document text
    • http://axecheat5.xyz/vizio_sound_bar_works_with_bluetooth_but_not_tv6sbku.pdfIn PDF document text
    • https://zupevinar.weebly.com/uploads/1/3/0/7/130739631/soduketitozoxe.pdfIn PDF document text
    • https://repositugi.weebly.com/uploads/1/3/0/7/130738607/pifemol.pdfIn PDF document text
    • https://gidupewurugi.weebly.com/uploads/1/3/1/6/131637306/zidadawebaxosi_rakipupabefe.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/ccce447c-0e69-4b16-80f1-31e81140896a/besegokulibob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f567c12-d693-4811-bbd7-05beb6598783/37213501364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8305e2f-0a17-4847-9042-0ea2cbba38ba/wapidorulipasotise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcdb5297-374c-49b3-8306-ae5faa847100/how_hard_is_ap_physics_c_electricity_and_magnetism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccee2534-cff5-4748-8028-604cd52cb2e5/83898400282.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/nediwatumozexot.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/when_backing_a_passenger_vehicle_to_the_left_a_driver_should.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d475102c-2c3e-47fa-8b81-b35d110e1922/garmin_drive_52_gps_best_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02abb2cf-d601-4f91-a1c3-93d609f8fd8a/64465707180.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/84699548622.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/mebikirunefexefisebigebap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f476ff5d-4c98-41b4-a205-061fe09e57fd/how_to_use_librecad_in_circle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3882cd56-2daa-4fab-a6ec-d7201935986a/which_immersion_blender_is_the_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa532a6f-61f3-4591-a5bc-7216f3f1a398/bow_tie_pasta_alfredo_peas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c55c9149-017d-4cd7-8772-f95e0bb41e86/security_analysis_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cefad14-69fd-4a12-aca7-953615cd4993/53552073906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4ced108-8769-4794-8621-b8d6b3d0d7da/que_es_una_propuesta_de_valor_en_un_plan_de_negocios.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 6588 bytes
SHA-256: 24fd6868f187b5667792517f9f69d22ac5a3de5011d4d3824467392effeade79
font_01_sfnt_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 5932 bytes
SHA-256: e5b91ec0fe692d263724f81acbd295a127d7ff571226f63a28500e555503405d
font_02_sfnt_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 4604 bytes
SHA-256: 839fa813f9bba634a1be75e744f8b76a59129ef831239ee0b931eee0b60df6d3
font_03_sfnt_off00013121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13121 11336 bytes
SHA-256: e8d0a99c6897771be9f6ce2c35b30c2768377958a3a1172fb420721e8cc6a84f
font_04_sfnt_off00015807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15807 16364 bytes
SHA-256: 3ee866cda942b2b8578a885e4a95700eac9956b8efab0c74766291b4da59015d