Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38453f9ffc75961…

MALICIOUS

PDF

86.2 KB Created: 2021-04-04 01:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 81dc22d9ff602f98806640f31ece8fd1 SHA-1: 18c86cdc545fe82005c41551ef42b70922e06194 SHA-256: f38453f9ffc759614694312d949dc99f2855736130d9ef6c3a560a29196d0b0b
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 0.9996

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://leonvi.ru/wix?keyword=algebra+2+making+practice+fun+45+answers PDF link annotation
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/essential_calculus_early_transcendentals_2nd_edition_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/coTSYic/red_ball_3_unblocked_66.pdfIn PDF document text
    • http://pankreatitum.ru/solving_right_triangles_with_trig_functionsns9qx.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/ez8nX34/fish_hunter_shooting_diary_mod_apk.pdfIn PDF document text
    • http://voiprormul.xyz/magic_bullet_parts_walmart2pll3.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/eTpiejd/wativisoderodasos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450907/normal_602b632e77b39.pdfIn PDF document text
    • http://topcreditmonitoring.info/82736864158m6bii.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480382/normal_6020b5ccc4dfc.pdfIn PDF document text
    • http://copyright-infringement.business/is_mary_poppins_auckland_cancelledrtif9.pdfIn PDF document text
    • http://dimopun.mywebcommunity.org/64141769808.pdfIn PDF document text
    • https://cdn.sqhk.co/kewixoretuze/zShgjjh/cinemark_brasil_park_shopping.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/cd0d947d-e8f7-44f8-91c4-fb0246c8cfde/41013101254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/059de3eb-7be3-4994-a9ce-b5610d836557/what_can_blood_type_a_eat_for_breakfast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c82badf6-5dee-4ded-8670-057a3679f7f1/77633732216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae896a9-4799-4b30-9947-a8c75d7b4dd1/el_nombre_de_la_rosa_pelicula_completa_en_espaol_latino_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca8e805f-0077-45ed-90bf-04f09b39afa2/noduvovujenapozutaredojot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fe3793f-8e9e-4189-94e2-065d7d27ebec/what_does_it_mean_if_key_is_stuck_in_ignition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d68485d-c733-4407-80e3-80b40e827e29/how_do_i_change_my_sentry_safe_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eecaa2ec-96b3-4b0f-a797-c5afa8460689/free_printable_phonics_worksheets_for_1st_grade.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_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 5964 bytes
SHA-256: 7264f68986dd554be0a28fb9040128d8aafa846bfebde7599ed69e4ec3ea90de
font_01_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 22408 bytes
SHA-256: 81bbe2a09992fdfcd121218986305739720b1dee553e3b9859f63aa98879b44b
font_02_sfnt_off0001336c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336C 16380 bytes
SHA-256: 8e728e646d4da23413dce2f896f8ed03fa210ed93f730373b473d23c60b6a6be