Malicious PDF — malware analysis report

Static analysis result for SHA-256 20de3474f72dee7f…

MALICIOUS

PDF

79.6 KB Created: 2021-03-29 08:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 549ebaac4b4e560ccdd9d65cac9d68e7 SHA-1: f113dd3fb067bfd2c2b6a5919fd34e1b06274c08 SHA-256: 20de3474f72dee7f32ec4f33f4ad47f40b566601dc63090a82b6c3aae1e21bad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/123?utm_term=absolute+cell+reference+in+google+spreadsheet PDF link annotation
    • http://urott-hu.com/ruvigosedxdq4.pdfIn PDF document text
    • http://auth02mobility.com/jejekedowekomarenujuge9gxo.pdfIn PDF document text
    • http://zebozewazogaso.scienceontheweb.net/20192435879.pdfIn PDF document text
    • http://dasazopemobor.mywebcommunity.org/65116586790.pdfIn PDF document text
    • https://cdn.sqhk.co/ditamozulipo/gijdjay/23474809684.pdfIn PDF document text
    • http://kosonetibekub.medianewsonline.com/on_green_dolphin_street_book.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/jedezegakiborebapog567p.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/LCjgYGy/stackable_rings_silver_and_gold.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/vodiwuf.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/jupuwaluziwogasixfodeb.pdfIn PDF document text
    • http://xunetokawetik.sportsontheweb.net/solve_simple_10_math_problems_quiz_avakin_life.pdfIn PDF document text
    • https://cdn.sqhk.co/regisanozoxo/f2giRYK/champions_centre_apartments_houston.pdfIn PDF document text
    • http://pebifakonek.sportsontheweb.net/kagan_structures.pdfIn PDF document text
    • http://pepojen.iblogger.org/bosasit.pdfIn PDF document text
    • http://nujagexurej.medianewsonline.com/toyota_pickup_frame_replacement.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nebojemesiwi.atwebpages.com/el_estado_liberal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e4a58a9-698b-40ed-812b-1f49523355f3/bissell_proheat_2x_not_spraying_water_on_floor.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/ciclo_de_krebs_pasos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7cb0372-6afc-4c8b-a44e-7ecdc94aacff/my_refrigerator_is_not_cooling_but_my_freezer_is_working.pdfIn PDF document text
    • http://xinudigiwuwa.epizy.com/29393392848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f780da06-af3a-4c9f-8bb6-9f8b7641e8a2/wekodit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0330bbe-1bbc-4474-9cda-75cbb80150a3/36626853677.pdfIn PDF document text
    • http://joveteki.epizy.com/respironics_remstar_system_one_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26528b74-603a-4e5b-a455-5324a259676f/concepto_de_artes_plasticas_para_nios_de_primaria.pdfIn PDF document text
    • http://lodumojokexiku.onlinewebshop.net/nedodetakobedixuduwumi.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_off0000f7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 5544 bytes
SHA-256: 8a2e66a0f8224022a7c3f3186d375a753d965cb5863376696b860e4f12a8438e
font_01_sfnt_off00010a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 11120 bytes
SHA-256: 75831501ee50b27debb4a8193843cb4ee4632524e6d8c28d62ee73c237e7e03a