Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4be7558e0c39501…

MALICIOUS

PDF

67.4 KB Created: 2021-04-07 02:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 24dc092063961d96939db1a7278e8bbd SHA-1: 322261fb26e307179d99f5b40510529dd4b053d5 SHA-256: d4be7558e0c39501eaad6dfe50c4cd6a9d88102ca5a58a8f0669e1ca60233c80
156 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 0.9992

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 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.
  • 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://fokemale.ru/award?keyword=adobe+pdf+reader+free+download+for+android PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/371f8248-d481-4827-8821-f027d596eaee/jejep.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/zukaxesewowadisamowakapu.pdfIn PDF document text
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_8ee675812a9140de8cd65d9cc2a2ed95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bea0110-2870-4caf-a428-65c2f92ebc2b/bagekofugazonuvegesexere.pdfIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_ff8b8bf4cc8149d5a87076a2e0d3576b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba87185-2947-42ca-be4c-81f087ce317e/nopizalupupal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b764a3-44cf-4a99-8f4c-2c70254d4dd7/how_to_build_your_own_vocabulary_app_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/292426ed-3865-40fa-a3e5-7f3a035625a7/audiolibros_jorge_bucay_cuentos_para_pensar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1c296ff-0f5f-4424-827f-37a442f70a75/savilevenopudisopatisumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43d5b8ba-df0d-449e-8ed3-b67490a9c5df/dexokitirezatudasexiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7909f13-1bae-4407-83f9-a46b293b590b/86137523654.pdfIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_36d90bc8b3a94fc8ade7de2239d8b9e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3360c97a-053e-4707-87f2-d2b26c090db6/click_clack_moo_activities.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/us_government_calendar_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/how_to_calculate_daily_interest_due_on_a_loan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c089273-8eb8-4000-a103-508e3515d693/kasifewezegetosotorutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49fe7df0-ea2b-4374-a991-df3ffb1c4d3e/panasonic_service_centre_contact_number_in_gurgaon.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/dark_angels_codex_8th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64fae388-6f67-4a69-83ab-eace98f852fa/can_i_renew_my_license_online_in_ma.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_6334f6e006654a05a08d3a69aac30638.pdf?index=trueIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_94fc2d06ef2d4bd7979aa2a75e8fb9fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7da5214-f607-4771-997c-dd2ecc5e62d8/foxatasurisafinuza.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/buell_1125r_performance_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2cde951-2cf5-4433-8dcc-fd704d19cc2a/draw_a_person_test_age_range.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_off0000cb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB44 5080 bytes
SHA-256: 0f79aa1787943aaea4f1738a5d8302a174729afee3b51eac54cdc6fdee86a0a9
font_01_sfnt_off0000dcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 10052 bytes
SHA-256: a932d8ab0ead285ee7843a76adf1133a4fdf1236936825fb36c6cc18067e3151