Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70a710b3cb631e0…

MALICIOUS

PDF

86.8 KB Created: 2021-04-25 14:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ab60ffbee84c7528836af0027314b7b2 SHA-1: 8d5aa97e002900098c97b6c971312b8a58f7d1b6 SHA-256: d70a710b3cb631e0e25a5d39bef9ae3f8b9ad5a176df0754ba0632972fdb775a
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 0.9996

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://seumenha.ru/strik?utm_term=when+does+the+rainbow+six+ranked+season+end PDF link annotation
    • https://cdn.sqhk.co/xodogesazapi/uihhau6/xivakowetogilebijagewemul.pdfIn PDF document text
    • https://cdn.sqhk.co/pexejaxer/nkiHHaG/97337002398.pdfIn PDF document text
    • https://cdn.sqhk.co/novupezezis/jjJjbT6/duwozeletedujukaj.pdfIn PDF document text
    • http://blankid.ru/138588876065quwu.pdfIn PDF document text
    • https://duvibebo.weebly.com/uploads/1/3/4/3/134375256/b9770d75150f6.pdfIn PDF document text
    • http://cabinetshub.xyz/kubota_zd326_owners_manuallwmir.pdfIn PDF document text
    • http://vitrinachel.ru/ensayo_del_libro_el_arte_de_amar_erich_frommuevjg.pdfIn PDF document text
    • https://wonuraje.weebly.com/uploads/1/3/5/9/135983109/dejejiseresubef.pdfIn PDF document text
    • http://vknacruckalaikov123.xyz/messenger_download_for_pc_20201ciyn.pdfIn PDF document text
    • https://sokexeziboril.weebly.com/uploads/1/3/4/9/134902232/pavewibexij.pdfIn PDF document text
    • https://nabovuguxobe.weebly.com/uploads/1/3/1/8/131871891/pifuxedux_sumimip.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/c5e5ffe6-bb8c-4ad9-9ea4-6443e227fa67/the_gangster_we_are_all_looking_for_chapter_5_summary.pdfIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_9479e60e436e4a42bf85f1862089fafb.pdf?index=trueIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_3711f7c296a94167b7773fda12e5e0be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76dfbe70-be79-4e8b-b77d-4b7e67c6ecb7/titans_curse_aot.pdfIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_66ef566457d94da0b37370cae8bc84d8.pdf?index=trueIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_c857774e8f5240059d43fb65541ea62a.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_7d9f038e3bd747959534a28aef812036.pdf?index=trueIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_b7a07489efca488ba011a6fcfbf82071.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6d7f31b-24e3-4ef6-b69e-12c9052ba3ad/18072296056.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_e94f4959f114491db3c2a902243d6e10.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_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 3688 bytes
SHA-256: 23c63f3c8692bd029c73611dd64b488d34004b709ccaf293378461ec4618ce49
font_01_sfnt_off00011169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11169 5256 bytes
SHA-256: 2b34de6018e3b21a07ebad6859e95225c504142bd42cfeeaf58be64843586f3c
font_02_sfnt_off0001235a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235A 11808 bytes
SHA-256: c58116180a7df5ad8b1e39df409320d6aacc3c238a4d5fa282588a3b4db5d0cc