Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ffb87a417c3ea6…

MALICIOUS

PDF

71.0 KB Created: 2021-10-03 09:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: de77e45a17fb44e3f44c431011872c50 SHA-1: 394a2b87e7ee493333c58101c2edbd30c58ef01d SHA-256: 66ffb87a417c3ea67588eb4a875c48c4c2ee265d138f3341cf31dafba30f25e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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 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://newdesert.pl/userfiles/file/9313747020.pdf In PDF document text
    • https://parisnordmedical.fr/docs/file/268326826.pdfIn PDF document text
    • https://ubranni.com/uploader/files/fifenuxeforekimisot.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/gaxuluri.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/tunafik.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/xufawama.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/bifibuwokezo.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/34656016312.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/divepagutesugozumeletofe.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/20286773897.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/75820196293.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/57050604909.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/29817085047.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/21232099421.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/jelapatizemeviwugezejeg.pdfIn PDF document text
    • https://buka.ru/sadm_files/6765140087.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/lutatowa.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210916075241.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/fetisiwozegefupewukibez.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/kelifubutazig.pdfIn PDF document text
    • https://schmitz.cz/res/file/xudonamevotawegawoxubime.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109192307086043.pdfIn PDF document text
    • http://lg-palette.com/upload/files/pinotalepefalowafubewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=deeper+life+bible+study+outlinesPDF link annotation
    • 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://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_off0000b305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB17 16724 bytes
SHA-256: 06549a6c3636138f69c1c908353bef13a1996d5cc6fef27f644d7bf9d75c3bb2
font_02_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 10684 bytes
SHA-256: df1674192e1cd0c6d3b872cf4018d4d70df98fa16e1f1cec1288d902425069a1

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