Malicious PDF — malware analysis report

Static analysis result for SHA-256 4faebd4efeada885…

MALICIOUS

PDF

83.2 KB Created: 2021-04-29 18:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 44d1c54cd8eaa79a21b05c6a7534eaa1 SHA-1: 73e549f4ee94509cc7d3a57295b1c6b72e5355bd SHA-256: 4faebd4efeada885d13c4e839bb476a0e25e1b5a3c048fd05a85778cdf85fc76
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics, suggesting it is designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://bologen.ru/strik?utm_term=que+es+el+cuerpo+humano+para+ni%25C3%25B1os+de+primer+grado PDF link annotation
    • https://rolutadaneked.weebly.com/uploads/1/3/2/6/132681657/dujulepa-genekonegadepam-nujilipel.pdfIn PDF document text
    • http://pitushok.space/14262617177ccw8n.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/57a153a7.pdfIn PDF document text
    • https://xupubiwe.weebly.com/uploads/1/3/4/3/134339906/e17d59e.pdfIn PDF document text
    • https://kodetinerimaguw.weebly.com/uploads/1/3/5/3/135347088/1648921.pdfIn PDF document text
    • https://fawewetipe.weebly.com/uploads/1/3/1/3/131379545/0adc08a178c2.pdfIn PDF document text
    • https://xobagesimijuvu.weebly.com/uploads/1/3/0/7/130776740/174daf1a9c013.pdfIn PDF document text
    • http://vorgazme.com/felugonuresigz4eo6.pdfIn PDF document text
    • https://benodamefeju.weebly.com/uploads/1/3/5/3/135346815/wujifilemejon.pdfIn PDF document text
    • https://pakotoroxup.weebly.com/uploads/1/3/0/8/130815058/woporumog-wuzagogefo-kogorerutam-rarafafipapo.pdfIn PDF document text
    • http://shishkin-seed.xyz/259250536964yeqk.pdfIn PDF document text
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/860361.pdfIn PDF document text
    • https://denowulak.weebly.com/uploads/1/3/3/9/133997299/zowenokap.pdfIn PDF document text
    • https://purajibimevu.weebly.com/uploads/1/3/4/6/134652176/leforosovi.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/delonghi_safe_heat_space_heater_manuals643o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_3eea0960fedc4adfb2fdb03b7413fea9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/806ded90-94df-4eb1-9196-19421b4b9374/ruwaxagujerebafavede.pdfIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_8445adcf161347e794f9c29929f066a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6026f5a4-7142-468c-9703-5813d8aa87d3/nzxt_phantom_530_review.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_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 5760 bytes
SHA-256: 32230e8ed010aaf25fe5217c80518c49fbf6515e120d521ac956fc74163f0383
font_01_sfnt_off00010160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10160 11640 bytes
SHA-256: 5742d702ae3ad4f6501fb52264fec0c76706e7ee45ae07367e17d66d1d700f30
font_02_sfnt_off00012758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 16124 bytes
SHA-256: 160a156ea896e4b5f058735de66997a4342b38ce6e8cba643e0512fb9cd539f7