Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfbd7ada4a0991c…

MALICIOUS

PDF

101.8 KB Created: 2021-03-18 14:01:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b697482db95129802263542804624191 SHA-1: 551b50b0d4b3bbf0d3cd8cb259583fca89e5c371 SHA-256: cdfbd7ada4a0991cf634f51dc04da48856c67e6db43ca4609ceee25b3bb838c5
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 0.9988

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://resalured.ru/wix?keyword=yeojin+kiss+later PDF link annotation
    • http://idealica-ufficiale.site/88450377489mxzxm.pdfIn PDF document text
    • http://meetsol.xyz/xefunimoranimafevokok6c761.pdfIn PDF document text
    • http://trychambre.xyz/tres_metros_sobre_el_cielo_3_film_completnfnww.pdfIn PDF document text
    • http://naturwows.space/eagoler_chokh_movie_480pkdw9y.pdfIn PDF document text
    • http://semengergel.ru/gta_5_crack_all_missing_files_downlouknxc.pdfIn PDF document text
    • http://preplafond.xyz/english_language_video_mp4kpkpm.pdfIn PDF document text
    • http://mon-cmso.best/is_dog_man_fetch_22_an_ar_bookhzzh6.pdfIn PDF document text
    • http://mobile-media.moscow/308442928cr3ay.pdfIn PDF document text
    • http://instapriz.website/how_to_check_your_starbucks_schedule_online25t6m.pdfIn PDF document text
    • http://yourlivehelp.com/74008510269vh9ji.pdfIn PDF document text
    • http://mebelrostov.ru/samsung_note_3_original_battery_price_in_indiajm438.pdfIn PDF document text
    • http://demask.space/suzifevubaseedc4s.pdfIn PDF document text
    • http://axecheat6.xyz/knex_raw_exampleoljql.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_382f48629a6a46eb86d6ef2b250c92e0.pdf?index=trueIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_50b66506d1a543adb14c157ff723c238.pdf?index=trueIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_ff4917c5c0c04904b61a7c256188ed90.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_5ff3ea6c27d84d1f9b008bc0abd2feee.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_356cef0ae05246739577e61e2b6b5dde.pdf?index=trueIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_be03f284907d499ebb6effe45b62ca44.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_62fe465c84254b42bc4a9733413a1ac8.pdf?index=trueIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_adeb1c61e7d44c5d8ca322c993c57c0e.pdf?index=trueIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_6c6cf6c8114240069ddbf27319dde06a.pdf?index=trueIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_0ec297d4fc5a4248888857111552ab0b.pdf?index=trueIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_de59504609e640bab6c70691e1fa7264.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 25468 bytes
SHA-256: 3e73495e232b761e8a59dff2c2d876b05412b1e5f9d18fb775aead602603ca18
font_01_sfnt_off00015490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15490 4780 bytes
SHA-256: c63e69da63977779d386fa33b689b5788e1d1b6bde5f48411b2b3d0723dbc86f
font_02_sfnt_off000164e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E4 10756 bytes
SHA-256: 2c7874761d69c4733703594386323bca12102222f56d44143a442fe9f1a8069f