Malicious PDF — malware analysis report

Static analysis result for SHA-256 00caaeff0ee26eea…

MALICIOUS

PDF

78.0 KB Created: 2021-04-04 05:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 34d9cca24e1673e83359684e487789a1 SHA-1: c19a3a2216737905e6044017233350e0739a36fa SHA-256: 00caaeff0ee26eead0509d019b230f88f44104f18386d7a9b393321b120a4512
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 0.9995

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://crophysi.ru/wix?keyword=simpsons+variables+worksheet PDF link annotation
    • https://bovagisobupuzod.weebly.com/uploads/1/3/1/0/131070774/8970365.pdfIn PDF document text
    • https://putofikanavo.weebly.com/uploads/1/3/0/7/130738484/8918937.pdfIn PDF document text
    • https://vexoxedurajawo.weebly.com/uploads/1/3/4/7/134704707/wanot.pdfIn PDF document text
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/dotaxopubedif.pdfIn PDF document text
    • https://digutejuwunapon.weebly.com/uploads/1/3/5/3/135325267/filufa_lagusu_nawevexalev.pdfIn PDF document text
    • https://vedewoxid.weebly.com/uploads/1/3/0/7/130738666/236904.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/8812387.pdfIn PDF document text
    • https://pomonomiwubexi.weebly.com/uploads/1/3/2/3/132302815/xesivano_naberasonugomo_romudidi_jagolefudij.pdfIn PDF document text
    • http://zaxunux.iblogger.org/lemawakebuguxudizuzogutun.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/e44f9abc173.pdfIn PDF document text
    • https://venefosek.weebly.com/uploads/1/3/1/8/131871910/6db53fd68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/06185b9e-ab9c-4d94-acf0-6eee0ab41377/technical_analysis_and_stock_market_profits_by_schabacker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/725227ac-0fd4-4b5c-85f4-3f417771a300/cdc_growth_chart_z_score_calculator.pdfIn PDF document text
    • http://famofuviw.epizy.com/keto_diet_meals.pdfIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_9ab749f23a5344a89e500954fb20c8a7.pdf?index=trueIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_66d28a69264d414e9422a76727d9662f.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_641687902c144f9cb6608171bb4e458f.pdf?index=trueIn PDF document text
    • http://ritarajekaxitev.rf.gd/ruby_bridges_norman_rockwell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a30aca-e8f7-4d72-927c-c6916345d934/lajubok.pdfIn PDF document text
    • http://gilokokivaw.epizy.com/active_directory_l2_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5120a673-8dda-4bea-84ce-92e5e7c951c6/lean_in_manufacturing_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeb2ba61-5fab-4e6f-86cc-ada383337727/71697352619.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 5304 bytes
SHA-256: 67e3b23ea77f88f567a83c00067ee08e9371c90cadace5ab731e7098feb065c1
font_01_sfnt_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 10196 bytes
SHA-256: e68100efd3b963df0fa2d2864f69df9ef034b3f37ac82b829d75afabc8cfe911
font_02_sfnt_off00011c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C36 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3